Isdate (transact-sql)

Working With SQL Dates

Our “Users” Table:

id	username	first	last	member_since
1	ohBillNotAgain	Hillary	Clinton	2011-12-25
2	internetCreator	Al	Gore	2011-12-8
3	dontMessWithTexas	George	Bush	2011-7-9

Let’s try to get all of our members before December 25, 2011.

Example

SELECT *
FROM Users
WHERE member_since < '2011-12-25'

Result

id	username	first	last	member_since
2	internetCreator	Al	Gore	2011-12-8
3	dontMessWithTexas	George	Bush	2011-7-9

Alright, we said BEFORE December 25, 2011, which means poor Hillary isn’t included because she is on that day. Al barely made the cut, but old George was way before our cut off date. I suppose we should actually talk about what happened. Up to WHERE member_since < ‘2011-12-25’, we know what were doing. We could probably guess what is going on here, but I’ll beat the dead horse. We check our member_since column to see if it is less than, <, our date, which was written in single quotes as ‘2011-12-25’. Often when googling for help with dates, you see this syntax referred to as ‘YYYY-MM-DD’, where Y is for year, M is for month, and D is for day, obviously. Each repetition is a symbol of a blank character space for that element. So, you only want 2 digits for month because that makes sense, and maybe you don’t care about the first 2 characters of year. Instead you just write, YY to get 11. Easy enough, onto the wonderful DATETIMEs

UPDATE несколько записей

Mysql distinct

Именно предложение WHERE определяет, сколько записей будет обновлено.

Следующая инструкция SQL обновит имя контакта до «Juan» для всех записей, где страна — «Mexico»:

Пример

UPDATE Customers
SET ContactName=’Juan’
WHERE Country=’Mexico’;

Выбор из таблицы «Customers» теперь будет выглядеть следующим образом:

CustomerID	CustomerName	ContactName	Address	City	PostalCode	Country
1	Alfreds Futterkiste	Alfred Schmidt	Obere Str. 57	Frankfurt	12209	Germany
2	Ana Trujillo Emparedados y helados	Juan	Avda. de la Constitución 2222	México D.F.	05021	Mexico
3	Antonio Moreno Taquería	Juan	Mataderos 2312	México D.F.	05023	Mexico
4	Around the Horn	Thomas Hardy	120 Hanover Sq.	London	WA1 1DP	UK
5	Berglunds snabbköp	Christina Berglund	Berguvsvägen 8	Luleå	S-958 22	Sweden

Параметр значений

Параметр

Описание

string

Требуемый. Строка, которая будет отформатирована до даты

format

Требуемый. Формат для использования. Может быть одно или комбинация следующих значений:

Формат	Описание
%a	Сокращенное название дня недели (от ВС до СБ)
%b	Сокращенное название месяца (январь-декабрь)
%c	Числовое название месяца (от 0 до 12)
%D	День месяца как числовое значение, за которым следует суффикс (1-й, 2-й, 3-й, …)
%d	День месяца как числовое значение (от 01 до 31)
%e	День месяца как числовое значение (от 0 до 31)
%f	Микросекунды (от 000000 до 999999)
%H	Час (с 00 до 23)
%h	Час (с 00 до 12)
%I	Час (с 00 до 12)
%i	Минуты (от 00 до 59)
%j	День года (от 001 до 366)
%k	Час (от 0 до 23)
%l	Час (от 1 до 12)
%M	Название месяца полностью (январь-декабрь)
%m	Название месяца в виде числового значения (от 00 до 12)
%p	AM или PM
%r	Время в формате 12 часов утра или вечера (hh:mm:ss AM/PM)
%S	Секунды (от 00 до 59)
%s	Секунды (от 00 до 59)
%T	Время в 24-часовом формате (hh:mm:ss)
%U	Неделя, где воскресенье — это первый день недели (с 00 до 53)
%u	Неделя, где понедельник — это первый день недели (с 00 до 53)
%V	Неделя, где воскресенье — это первый день недели (с 01 по 53). Используется с %X
%v	Неделя, где понедельник — это первый день недели (с 01 по 53). Используется с %X
%W	Название дня недели полностью (с воскресенья по субботу)
%w	День недели, где воскресенье=0 и суббота=6
%X	Год для недели, где воскресенье — это первый день недели. Используется с %V
%x	Год для недели, где понедельник — это первый день недели. Используется с %V
%Y	Год как числовое, 4-значное значение
%y	Год как числовое, 2-значное значение

Set identity_insert (transact-sql)set identity_insert (transact-sql)

Функция DATEPART

Create type (transact-sql)create type (transact-sql)

DATEPART ( datepart , date )

Эта функция возвращает целое число, представляющее собой указанную аргументом datepart часть заданной вторым аргументом даты (date).
Список допустимых значений аргумента datepart, описанный выше в данном разделе, дополняется еще одним значением

Datepart	Допустимые сокращения
Weekday — день недели	dw

DATEPARTSET DATEFIRST

SELECT DATEPART(hh, time_out)*60 + DATEPART(mi, time_out) FROM trip WHERE trip_no=1123

SELECT DATEPART(hh, time_in)*60 + DATEPART(mi, time_in) FROM trip WHERE trip_no=1123

Теперь мы должны сравнить, превышает ли время прилета время вылета. Если это так, вычесть из первого второе, чтобы получить продолжительность рейса. В противном
случае к разности нужно добавить одни сутки (24*60 = 1440 минут).

SELECT CASE WHEN time_dep>=time_arr THEN time_arr-time_dep+1440 ELSE time_arr-time_dep END dur FROM
(
SELECT DATEPART(hh, time_out)*60 + DATEPART(mi, time_out) time_dep,
DATEPART(hh, time_in)*60 + DATEPART(mi, time_in) time_arr
FROM trip WHERE trip_no=1123
) tm

Пример

SELECT pt.trip_no, DATEADD(mi, DATEPART(hh,time_out)*60 + DATEPART(mi,time_out), date)
FROM pass_in_trip pt JOIN trip t ON pt.trip_no=t.trip_no WHERE t.trip_no=1123

Trip_no	Time
1123	2003-04-05 16:20:00.000
1123	2003-04-08 16:20:00.000

DISTINCT

SQL Server

There are several ways to get the current date in SQL Server, and all of them use functions.

Function	Data Type	Returns
SYSDATETIME()	datetime2	Server date time to 7 fractional seconds
SYSDATETIMEOFFSET()	datetimeoffset	Server date time with time zone to 7 fractional seconds
SYSUTCDATETIME()	datetime2	Server date time in UTC to 7 fractional seconds
CURRENT_TIMESTAMP	datetime	Server date time to 3 fractional seconds
GETDATE()	datetime	Server date time to 3 fractional seconds
GETUTCDATE()	datetime	Server date time in UTC to 3 fractional seconds

These six functions all return the date and time to different amounts of fractional seconds or based on time zones. Notice that CURRENT_TIMESTAMP does not need any opening or closing brackets.

(You can read more about MySQL date data types and functions in this guide)

Let’s see an example of this.

The results are below (translated to rows to make it easier to compare):

Function	Result
SYSDATETIME()	2020-07-15 16:24:38.7750094
SYSDATETIMEOFFSET()	2020-07-15 16:24:38.7750094 +00:00
SYSUTCDATETIME()	2020-07-15 06:24:38.7750094
CURRENT_TIMESTAMP	2020-07-15 16:24:38.773
GETDATE()	2020-07-15 16:24:38.773
GETUTCDATE()	2020-07-15 06:24:38.773

You can see some differences here:

The first three functions show fractional seconds to 7 places.
The two UTC time functions show the current time in the UTC time zone. I ran these functions in Melbourne, Australia, which is UTC +10.

You can also see that CURRENT_TIMESTAMP and GETDATE() show the same values.

CURRENT_TIMESTAMP vs GETDATE

What’s the difference between CURRENT_TIMESTAMP and GETDATE() in SQL Server?

CURRENT_TIMESTAMP is an ANSI SQL compliant function, meaning it complies with the standards (and is likely to exist in other database vendors). GETDATE() is the T-SQL version of that function.

How to Get Just the Current Date in SQL Server

The functions above show the current date and time.

But what if you only want to get the current date, and not the time?

There are two ways you can do that: use CAST or use CONVERT.

I’ve written about this method in a recent post: How to Convert DATETIME to DATE in SQL Server.

Here’s an example:

Result:

date_cast	date_convert
2020-07-15	2020-07-15

Both methods return the same value.

ADDDATE(date,INTERVAL expr unit), ADDDATE(expr,days)

When invoked with the INTERVAL form of the second argument, ADDDATE() is a synonym for DATE_ADD(). The related function SUBDATE() is a synonym for DATE_SUB(). For information on the INTERVAL unit argument, see the discussion for DATE_ADD().

mysql> SELECT DATE_ADD('1998-01-02', INTERVAL 31 DAY);
+---------------------------------------------------------+
| DATE_ADD('1998-01-02', INTERVAL 31 DAY)                 |
+---------------------------------------------------------+
| 1998-02-02                                              |
+---------------------------------------------------------+
1 row in set (0.00 sec)

mysql> SELECT ADDDATE('1998-01-02', INTERVAL 31 DAY);
+---------------------------------------------------------+
| ADDDATE('1998-01-02', INTERVAL 31 DAY)                  |
+---------------------------------------------------------+
| 1998-02-02                                              |
+---------------------------------------------------------+
1 row in set (0.00 sec)

When invoked with the days form of the second argument, MySQL treats it as an integer number of days to be added to expr.

mysql> SELECT ADDDATE('1998-01-02', 31);
+---------------------------------------------------------+
| DATE_ADD('1998-01-02', INTERVAL 31 DAY)                 |
+---------------------------------------------------------+
| 1998-02-02                                              |
+---------------------------------------------------------+
1 row in set (0.00 sec)

PostgreSQL

To get the current date in PostgreSQL, we can use one of several functions:

Function	Returns
CURRENT_DATE	Current date and time
CURRENT_TIMESTAMP	Current date and time with timezone
LOCALTIMESTAMP	Current date and time
NOW	Current date and time, same as CURRENT_TIMESTAMP

The return values of these functions look like this:

Results:

Function	Result
CURRENT_DATE	2020-07-16
CURRENT_TIMESTAMP	2020-07-16 05:19:32.201578 EDT
LOCALTIMESTAMP	2020-07-16 05:19:32
NOW	2020-07-16 05:19:32.201578 EDT

We can see that CURRENT_DATE shows only the date, but CURRENT_TIMESTAMP and LOCALTIMESTAMP show the date and time.

What’s the Difference Between CURRENT_TIMESTAMP and LOCALTIMESTAMP in PostgreSQL?

The difference is that LOCALTIMESTAMP returns a timestamp without a timezone, and CURRENT_TIMESTAMP returns a timestamp with a timezone.

Создание полей даты и времени

Таблица, содержащая типы данных DATE и DATETIME, создается так же, как и другие столбцы. Например, мы можем создать новую таблицу под названием orders, которая содержит столбцы номера заказа, заказанного товара, даты заказа и даты доставки заказа:

CREATE TABLE `MySampleDB`.`orders` (
  `order_no` INT  NOT NULL AUTO_INCREMENT,
  `order_item` TEXT  NOT NULL,
  `order_date` DATETIME  NOT NULL,
  `order_delivery` DATE  NOT NULL,
  PRIMARY KEY (`order_no`)
)
ENGINE = InnoDB;

Столбец ORDER_DATE — это поле типа MySQL DATE TIME, в которое мы записываем дату и время, когда был сделан заказ. Для даты доставки невозможно предсказать точное время, поэтому мы записываем только дату.

SQL Справочник

SQL Ключевые слова
ADD
ADD CONSTRAINT
ALTER
ALTER COLUMN
ALTER TABLE
ALL
AND
ANY
AS
ASC
BACKUP DATABASE
BETWEEN
CASE
CHECK
COLUMN
CONSTRAINT
CREATE
CREATE DATABASE
CREATE INDEX
CREATE OR REPLACE VIEW
CREATE TABLE
CREATE PROCEDURE
CREATE UNIQUE INDEX
CREATE VIEW
DATABASE
DEFAULT
DELETE
DESC
DISTINCT
DROP
DROP COLUMN
DROP CONSTRAINT
DROP DATABASE
DROP DEFAULT
DROP INDEX
DROP TABLE
DROP VIEW
EXEC
EXISTS
FOREIGN KEY
FROM
FULL OUTER JOIN
GROUP BY
HAVING
IN
INDEX
INNER JOIN
INSERT INTO
INSERT INTO SELECT
IS NULL
IS NOT NULL
JOIN
LEFT JOIN
LIKE
LIMIT
NOT
NOT NULL
OR
ORDER BY
OUTER JOIN
PRIMARY KEY
PROCEDURE
RIGHT JOIN
ROWNUM
SELECT
SELECT DISTINCT
SELECT INTO
SELECT TOP
SET
TABLE
TOP
TRUNCATE TABLE
UNION
UNION ALL
UNIQUE
UPDATE
VALUES
VIEW
WHERE

MySQL Функции
Функции строк
ASCII
CHAR_LENGTH
CHARACTER_LENGTH
CONCAT
CONCAT_WS
FIELD
FIND_IN_SET
FORMAT
INSERT
INSTR
LCASE
LEFT
LENGTH
LOCATE
LOWER
LPAD
LTRIM
MID
POSITION
REPEAT
REPLACE
REVERSE
RIGHT
RPAD
RTRIM
SPACE
STRCMP
SUBSTR
SUBSTRING
SUBSTRING_INDEX
TRIM
UCASE
UPPER
Функции чисел
ABS
ACOS
ASIN
ATAN
ATAN2
AVG
CEIL
CEILING
COS
COT
COUNT
DEGREES
DIV
EXP
FLOOR
GREATEST
LEAST
LN
LOG
LOG10
LOG2
MAX
MIN
MOD
PI
POW
POWER
RADIANS
RAND
ROUND
SIGN
SIN
SQRT
SUM
TAN
TRUNCATE
Функции дат
ADDDATE
ADDTIME
CURDATE
CURRENT_DATE
CURRENT_TIME
CURRENT_TIMESTAMP
CURTIME
DATE
DATEDIFF
DATE_ADD
DATE_FORMAT
DATE_SUB
DAY
DAYNAME
DAYOFMONTH
DAYOFWEEK
DAYOFYEAR
EXTRACT
FROM_DAYS
HOUR
LAST_DAY
LOCALTIME
LOCALTIMESTAMP
MAKEDATE
MAKETIME
MICROSECOND
MINUTE
MONTH
MONTHNAME
NOW
PERIOD_ADD
PERIOD_DIFF
QUARTER
SECOND
SEC_TO_TIME
STR_TO_DATE
SUBDATE
SUBTIME
SYSDATE
TIME
TIME_FORMAT
TIME_TO_SEC
TIMEDIFF
TIMESTAMP
TO_DAYS
WEEK
WEEKDAY
WEEKOFYEAR
YEAR
YEARWEEK
Функции расширений
BIN
BINARY
CASE
CAST
COALESCE
CONNECTION_ID
CONV
CONVERT
CURRENT_USER
DATABASE
IF
IFNULL
ISNULL
LAST_INSERT_ID
NULLIF
SESSION_USER
SYSTEM_USER
USER
VERSION

SQL Server функции
Функции строк
ASCII
CHAR
CHARINDEX
CONCAT
Concat with +
CONCAT_WS
DATALENGTH
DIFFERENCE
FORMAT
LEFT
LEN
LOWER
LTRIM
NCHAR
PATINDEX
QUOTENAME
REPLACE
REPLICATE
REVERSE
RIGHT
RTRIM
SOUNDEX
SPACE
STR
STUFF
SUBSTRING
TRANSLATE
TRIM
UNICODE
UPPER
Функции чисел
ABS
ACOS
ASIN
ATAN
ATN2
AVG
CEILING
COUNT
COS
COT
DEGREES
EXP
FLOOR
LOG
LOG10
MAX
MIN
PI
POWER
RADIANS
RAND
ROUND
SIGN
SIN
SQRT
SQUARE
SUM
TAN
Функции дат
CURRENT_TIMESTAMP
DATEADD
DATEDIFF
DATEFROMPARTS
DATENAME
DATEPART
DAY
GETDATE
GETUTCDATE
ISDATE
MONTH
SYSDATETIME
YEAR
Функции расширений
CAST
COALESCE
CONVERT
CURRENT_USER
IIF
ISNULL
ISNUMERIC
NULLIF
SESSION_USER
SESSIONPROPERTY
SYSTEM_USER
USER_NAME

MS Access функции
Функции строк
Asc
Chr
Concat with &
CurDir
Format
InStr
InstrRev
LCase
Left
Len
LTrim
Mid
Replace
Right
RTrim
Space
Split
Str
StrComp
StrConv
StrReverse
Trim
UCase
Функции чисел
Abs
Atn
Avg
Cos
Count
Exp
Fix
Format
Int
Max
Min
Randomize
Rnd
Round
Sgn
Sqr
Sum
Val
Функции дат
Date
DateAdd
DateDiff
DatePart
DateSerial
DateValue
Day
Format
Hour
Minute
Month
MonthName
Now
Second
Time
TimeSerial
TimeValue
Weekday
WeekdayName
Year
Другие функции
CurrentUser
Environ
IsDate
IsNull
IsNumeric

SQL ОператорыSQL Типы данныхSQL Краткий справочник

Извлечение данных по дате и времени

В MySQL мы можем отфильтровать извлеченные данные в зависимости от даты и времени. Например, мы можем извлечь только те заказы, доставка которых запланирована на ноябрь:

mysql> SELECT * FROM orders WHERE MONTHNAME(order_delivery) = 'November';
+----------+------------+---------------------+----------------+
| order_no | order_item | order_date          | order_delivery |
+----------+------------+---------------------+----------------+
|        1 | iPhone 8Gb | 2007-10-23 11:37:55 | 2007-11-06     |
+----------+------------+---------------------+----------------+
1 row in set (0.00 sec)

Точно так же мы можем использовать BETWEEN, чтобы выбрать товары, доставка которых произойдет между двумя указанными датами. Например:

mysql> SELECT * FROM orders WHERE order_delivery BETWEEN '2007-12-01' AND '2008-01-01';
+----------+----------------+---------------------+----------------+
| order_no | order_item     | order_date          | order_delivery |
+----------+----------------+---------------------+----------------+
|        2 | ipod Touch 4Gb | 2007-10-23 11:51:09 | 2007-12-23     |
+----------+----------------+---------------------+----------------+
1 row in set (0.03 sec)

CURTIME()

Returns the current time as a value in ‘HH:MM:SS’ or HHMMSS format, depending on whether the function is used in a string or in a numeric context. The value is expressed in the current time zone.

mysql> SELECT CURTIME();
+---------------------------------------------------------+
| CURTIME()                                               |
+---------------------------------------------------------+
| 23:50:26                                                |
+---------------------------------------------------------+
1 row in set (0.00 sec)

mysql> SELECT CURTIME() + 0;
+---------------------------------------------------------+
| CURTIME() + 0                                           |
+---------------------------------------------------------+
| 235026                                                  |
+---------------------------------------------------------+
1 row in set (0.00 sec)

SQL Справочник

SQL ОператорыSQL Типы данныхSQL Краткий справочник

Oracle

There are a few ways to get the current date in Oracle SQL.

Function	Data Type	Returns
SYSDATE	date	Current date and time of the server
CURRENT_DATE	date	Current date and time in the session time zone
CURRENT_TIMESTAMP	timestamp with time zone	Current date and time with time zone in the session time zone
LOCALTIMESTAMP	timestamp	Current date and time in the session time zone
SYSTIMESTAMP	timestamp with time zone	Current date and time of the server

The method you use depends on which data type you want and whether you want the server or session time zone.

Let’s see some examples of these functions.

The results are below (translated to rows to make it easier to compare):

Function	Result
SYSDATE	15-JUL-20
CURRENT_DATE	15-JUL-20
CURRENT_TIMESTAMP	15-JUL-20 12.08.25.095819 AM US/PACIFIC
LOCALTIMESTAMP	15-JUL-20 12.08.25.095819 AM
SYSTIMESTAMP	15-JUL-20 07.08.25.095818 AM +00:00

We can see a few things here:

SYSDATE and CURRENT_DATE show a similar output.
CURRENT_TIMESTAMP and LOCALTIMESTAMP show the same value but one is with the timezone and one is without.

One thing to be aware of is that even though SYSDATE and CURRENT_DATE display the date here, they actually include the time.

To see the time component, we can use TO_CHAR, which shows the difference between the two functions:

Operation	Result
SYSDATE	15-JUL-20
SYSDATE_FULL	2020-07-15 06:51:58
CURRENT_DATE	15-JUL-20
CURRENT_DATE_FULL	2020-07-15 11:51:58

We can see that both dates are the same, but the times are different.

What’s the Difference Between SYSDATE and CURRENT_DATE in Oracle?

These two functions look like they show the same thing. So how are they different?

SYSDATE is based on the server, and CURRENT_DATE is based on the user’s session.

This means if the user is based in New York and the database server is in London, the SYSDATE function will return the London date and time, and the CURRENT_DATE function will return the New York date and time.

SQL References

SQL Keywords
ADD
ADD CONSTRAINT
ALTER
ALTER COLUMN
ALTER TABLE
ALL
AND
ANY
AS
ASC
BACKUP DATABASE
BETWEEN
CASE
CHECK
COLUMN
CONSTRAINT
CREATE
CREATE DATABASE
CREATE INDEX
CREATE OR REPLACE VIEW
CREATE TABLE
CREATE PROCEDURE
CREATE UNIQUE INDEX
CREATE VIEW
DATABASE
DEFAULT
DELETE
DESC
DISTINCT
DROP
DROP COLUMN
DROP CONSTRAINT
DROP DATABASE
DROP DEFAULT
DROP INDEX
DROP TABLE
DROP VIEW
EXEC
EXISTS
FOREIGN KEY
FROM
FULL OUTER JOIN
GROUP BY
HAVING
IN
INDEX
INNER JOIN
INSERT INTO
INSERT INTO SELECT
IS NULL
IS NOT NULL
JOIN
LEFT JOIN
LIKE
LIMIT
NOT
NOT NULL
OR
ORDER BY
OUTER JOIN
PRIMARY KEY
PROCEDURE
RIGHT JOIN
ROWNUM
SELECT
SELECT DISTINCT
SELECT INTO
SELECT TOP
SET
TABLE
TOP
TRUNCATE TABLE
UNION
UNION ALL
UNIQUE
UPDATE
VALUES
VIEW
WHERE

MySQL Functions
String Functions
ASCII
CHAR_LENGTH
CHARACTER_LENGTH
CONCAT
CONCAT_WS
FIELD
FIND_IN_SET
FORMAT
INSERT
INSTR
LCASE
LEFT
LENGTH
LOCATE
LOWER
LPAD
LTRIM
MID
POSITION
REPEAT
REPLACE
REVERSE
RIGHT
RPAD
RTRIM
SPACE
STRCMP
SUBSTR
SUBSTRING
SUBSTRING_INDEX
TRIM
UCASE
UPPER

Numeric Functions
ABS
ACOS
ASIN
ATAN
ATAN2
AVG
CEIL
CEILING
COS
COT
COUNT
DEGREES
DIV
EXP
FLOOR
GREATEST
LEAST
LN
LOG
LOG10
LOG2
MAX
MIN
MOD
PI
POW
POWER
RADIANS
RAND
ROUND
SIGN
SIN
SQRT
SUM
TAN
TRUNCATE

Date Functions
ADDDATE
ADDTIME
CURDATE
CURRENT_DATE
CURRENT_TIME
CURRENT_TIMESTAMP
CURTIME
DATE
DATEDIFF
DATE_ADD
DATE_FORMAT
DATE_SUB
DAY
DAYNAME
DAYOFMONTH
DAYOFWEEK
DAYOFYEAR
EXTRACT
FROM_DAYS
HOUR
LAST_DAY
LOCALTIME
LOCALTIMESTAMP
MAKEDATE
MAKETIME
MICROSECOND
MINUTE
MONTH
MONTHNAME
NOW
PERIOD_ADD
PERIOD_DIFF
QUARTER
SECOND
SEC_TO_TIME
STR_TO_DATE
SUBDATE
SUBTIME
SYSDATE
TIME
TIME_FORMAT
TIME_TO_SEC
TIMEDIFF
TIMESTAMP
TO_DAYS
WEEK
WEEKDAY
WEEKOFYEAR
YEAR
YEARWEEK

Advanced Functions
BIN
BINARY
CASE
CAST
COALESCE
CONNECTION_ID
CONV
CONVERT
CURRENT_USER
DATABASE
IF
IFNULL
ISNULL
LAST_INSERT_ID
NULLIF
SESSION_USER
SYSTEM_USER
USER
VERSION

SQL Server Functions
String Functions
ASCII
CHAR
CHARINDEX
CONCAT
Concat with +
CONCAT_WS
DATALENGTH
DIFFERENCE
FORMAT
LEFT
LEN
LOWER
LTRIM
NCHAR
PATINDEX
QUOTENAME
REPLACE
REPLICATE
REVERSE
RIGHT
RTRIM
SOUNDEX
SPACE
STR
STUFF
SUBSTRING
TRANSLATE
TRIM
UNICODE
UPPER

Numeric Functions
ABS
ACOS
ASIN
ATAN
ATN2
AVG
CEILING
COUNT
COS
COT
DEGREES
EXP
FLOOR
LOG
LOG10
MAX
MIN
PI
POWER
RADIANS
RAND
ROUND
SIGN
SIN
SQRT
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TAN

Date Functions
CURRENT_TIMESTAMP
DATEADD
DATEDIFF
DATEFROMPARTS
DATENAME
DATEPART
DAY
GETDATE
GETUTCDATE
ISDATE
MONTH
SYSDATETIME
YEAR

Advanced Functions
CAST
COALESCE
CONVERT
CURRENT_USER
IIF
ISNULL
ISNUMERIC
NULLIF
SESSION_USER
SESSIONPROPERTY
SYSTEM_USER
USER_NAME

MS Access Functions
String Functions
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Str
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Trim
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Numeric Functions
Abs
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Date Functions
Date
DateAdd
DateDiff
DatePart
DateSerial
DateValue
Day
Format
Hour
Minute
Month
MonthName
Now
Second
Time
TimeSerial
TimeValue
Weekday
WeekdayName
Year

Other Functions
CurrentUser
Environ
IsDate
IsNull
IsNumeric

SQL Quick Ref

Пример

Рассмотрим примеры MySQL функции DATE_FORMAT, чтобы понять, как использовать функцию DATE_FORMAT в MySQL.
Например:

MySQL

mysql> SELECT DATE_FORMAT(‘2014-11-28’, ‘%Y’);

#Результат: 2014

mysql> SELECT DATE_FORMAT(‘2014-11-01’, ‘%M %d, %Y’);

#Результат: November 01, 2014

mysql> SELECT DATE_FORMAT(‘2014-11-01’, ‘%M %e %Y’);

#Результат: November 1 2014

mysql> SELECT DATE_FORMAT(‘2014-11-28’, ‘%W, %M %e, %Y’);

#Результат: Friday, November 28, 2014

mysql> SELECT DATE_FORMAT(‘2014-11-28’, ‘%W’);

#Результат: Friday

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mysql>SELECTDATE_FORMAT(‘2014-11-28′,’%Y’);

#Результат:   2014

mysql>SELECTDATE_FORMAT(‘2014-11-01′,’%M %d, %Y’);

#Результат:   November 01, 2014

mysql>SELECTDATE_FORMAT(‘2014-11-01′,’%M %e %Y’);

#Результат:   November 1 2014

mysql>SELECTDATE_FORMAT(‘2014-11-28′,’%W, %M %e, %Y’);

#Результат:   Friday, November 28, 2014

mysql>SELECTDATE_FORMAT(‘2014-11-28′,’%W’);

#Результат:   Friday