General MySQL Oracle SQL Server

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MySQL Functions on Result Set Windows
Where to find reference information and tutorials on MySQL database functions on Result Set Windows? I want to know how to use FIRST_VALUE(), ROW_NUMBER() and other window functions. Here is a collection of reference information and tutorials on MySQL database functions on Result Set Windows compile... 2024-05-15, 1992🔥, 0💬

Removed: ENCRYPT() - Unix crypt() Hash Algorithm
How to generate a hash value with the Unix crypt() algorithm using the ENCRYPT() function? ENCRYPT(bytes) is a MySQL built-in function that generates a hash value with the Unix crypt() algorithm. Note that ENCRYPT() is no longer supported. It was: Introduced MySQL 4.0. Removed in MySQL 8.0. Related ... 2024-05-15, 1953🔥, 0💬

CUME_DIST() - Cumulative Distribution of Sorted Values
How to calculate the cumulative distribution of the sorting field expression in the current result set window using the CUME_DIST() function? CUME_DIST() is a MySQL built-in window function that calculates the cumulative distribution of the sorting field expression in the current result set window. ... 2024-05-15, 1871🔥, 0💬

RELEASE_LOCK() - Release Lock Instance
How to release an instance of a given lock associated with the current connection session using the RELEASE_LOCK() function? RELEASE_LOCK(lock) is a MySQL built-in function that releases an instance of a given lock associated with the current connection session. It returns 1 if released Successfully... 2023-12-20, 1961🔥, 0💬

RELEASE_ALL_LOCKS() - Release All Locks
How to release all locks associated with the current connection session using the RELEASE_ALL_LOCKS() function? RELEASE_ALL_LOCKS(lock) is a MySQL built-in function that releases all locks associated with the current connection session. It returns the number of locks released. For example: SELECT GE... 2023-12-20, 2028🔥, 0💬

IS_USED_LOCK() - Checking Lock Owner
How to check the owner of a user defined lock using the IS_USED_LOCK() function? IS_USED_LOCK(lock) is a MySQL built-in function that returns the connection id the lock associated with if the lock is in use, NULL otherwise. For example: SELECT GET_LOCK('MyLock', 60), IS_USED_LOCK('MyLock'); -- +----... 2023-12-20, 1658🔥, 0💬

GET_LOCK() - Requesting User Defined Lock
How to request a user defined lock using the GET_LOCK() function? GET_LOCK(lock, timeout) is a MySQL built-in function that tries to obtain a user defined lock within a timeout period. It returns 1 if successful, 0 if failed. For example: SELECT GET_LOCK('MyLock', 60), IS_FREE_LOCK('MyLock'), IS_USE... 2023-12-20, 1927🔥, 0💬

IS_FREE_LOCK() - Checking Lock Status
How to check the status of a user defined lock using the IS_FREE_LOCK() function? IS_FREE_LOCK(lock) is a MySQL built-in function that returns 1 if a given user lock is free, 0 otherwise. For example: SELECT GET_LOCK('MyLock', 60), IS_FREE_LOCK('MyLock'); -- +------------------------+---- -----------... 2023-12-20, 1604🔥, 0💬

MAKE_SET() - Filtering List with Binary Set
How to filter a list of strings with a binary set provided as an integer using the MAKE_SET() function? MAKE_SET(bits, str1, str2, ...) is a MySQL built-in function that filters a list of strings with a binary set provided as an integer. It loops through every bit of the given integer "bits" startin... 2023-12-20, 2138🔥, 0💬

EXPORT_SET() - Exporting Binary Set to On/Off Flags
How to export an integer as a binary set to on/off flags using the EXPORT_SET() function? EXPORT_SET(bits, on, off, delimiter, len) is a MySQL built-in function that converts an integer as a binary set (a sequence of bits) to on/off flags. It loops through every bit of the given integer "bits" start... 2023-12-20, 1806🔥, 0💬

SLEEP() - Holding Statement Execution
How to hold the statement execution for some time using the SLEEP() function? SLEEP(sec) is a MySQL built-in function that holds the execution of the current statement for sec seconds. For example: SELECT SYSDATE(), SLEEP(2), SYSDATE(); -- +---------------------+------- ---+---------------------+-- ... 2023-12-19, 2068🔥, 0💬

LEAST() - Finding the Least/Minimum Value
How to find the least (minimum) value of a given list of values using the LEAST() function? LEAST(val1, val2, ...) is a MySQL built-in function that returns the least (minimum) value of a given list of values. For example: SELECT LEAST(70, 89, 73, 99, 101, 110, 116, 101, 114); -- +------------------... 2023-12-19, 1972🔥, 0💬

NULLIF() - NULL on Equal Values
How to generate NULL with equal values using the NULLIF() function? NULLIF(val1, val2) is a MySQL built-in function that returns NULL if the first argument equals the second, the first argument otherwise. For example: SELECT NULLIF('yes', 'yes'), NULLIF('yes', 'no'); -- +----------------------+-----. .. 2023-12-19, 1847🔥, 0💬

JSON_VALID() - Validating JSON Value
How to verify if value is a JSON (JavaScript Object Notation) value using the JSON_VALID() function? JSON_VALID(val) is a MySQL built-in function that returns 1 if the given value is a valid JSON value. For example: SELECT JSON_VALID('hello'), JSON_VALID('"hello"'); -- +---------------------+------- ... 2023-12-17, 3266🔥, 0💬

JSON_QUOTE() - Quoting JSON String
How to convert a regular character string into a JSON (JavaScript Object Notation) string using the JSON_QUOTE() function? JSON_QUOTE(str) is a MySQL built-in function that converts a regular character string into a JSON string by quoting the string with double quotes. It replaces the double-quote c... 2023-12-10, 2407🔥, 0💬

JSON_PRETTY() - Validating JSON Value
How to encode a JSON (JavaScript Object Notation) value into a pretty-printing string using the JSON_PRETTY() function? JSON_PRETTY(json) is a MySQL built-in function that encodes a JSON (JavaScript Object Notation) value into a pretty-printing string. For example: SELECT JSON_PRETTY('["a",1,{"key1"... 2023-12-10, 2029🔥, 0💬

IS_UUID() - Validating UUID String Format
How to validate a UUID (Universal Unique IDentifier) string using the IS_UUID() function? IS_UUID(uuid) is a MySQL built-in function that validates a UUID (Universal Unique IDentifier) string. It only checks if the given UUID is a 32-digit hexadecimal string or not. For example: SELECT IS_UUID('447f... 2023-12-08, 2185🔥, 0💬

UUID() - Generating UUID String
How to generate a UUID (Universal Unique IDentifier) string using the UUID() function? UUID() is a MySQL built-in function that returns a UUID (Universal Unique IDentifier) string. For example: SELECT UUID(), UUID(); -- +----------------------------- ---------+-------------------- ------------------+... 2023-12-08, 1998🔥, 0💬

SUM() - Total Value in Group
How to calculate the total value of a field expression in result set groups using the SUM() function? SUM(expr) is a MySQL built-in aggregate function that calculates the total value of a field expression in result set groups. For example: SELECT help_category_id, SUM(help_topic_id), COUNT(help_topi... 2023-12-01, 4322🔥, 0💬

VARIANCE() - Synonym for VAR_POP()
What's the difference between VARIANCE() and VAR_POP() functions? VARIANCE(expr) is a synonym for the VAR_POP(expr) function. Related MySQL functions: VAR_POP() - Population Standard Variance   ⇒ Window Functions ⇐ VAR_SAMP() - Sample Standard Variance ⇑ MySQL Functions on Aggregation Groups ⇑⇑ My... 2023-12-01, 1986🔥, 0💬

VAR_SAMP() - Sample Standard Variance
How to calculate the sample standard variance of a field expression in result set groups using the VAR_SAMP() function? VAR_SAMP(expr) is a MySQL built-in aggregate function that calculates the sample standard variance of a field expression in result set groups. For example: SELECT help_category_id,... 2023-12-01, 1935🔥, 0💬

VAR_POP() - Population Standard Variance
How to calculate the population standard variance of a field expression in result set groups using the VAR_POP() function? VAR_POP(expr) is a MySQL built-in aggregate function that calculates the population standard variance of a field expression in result set groups. For example: SELECT help_catego... 2023-12-01, 1776🔥, 0💬

YEARWEEK() - Year Week Combination
How to calculate the year week combination from a given date using the YEARWEEK() function? YEARWEEK(date, mode) is a MySQL built-in function that calculates the year week combination from a given date. For example: SELECT YEARWEEK('2024-03-04'), WEEK('2024-03-04'); -- +------------------------+---- ... 2023-11-16, 1902🔥, 0💬

SQRT() - Square Root of X
How to calculate the square root of a given number using the SQRT() function? SQRT(X) is a MySQL built-in function that calculates the square root of a given number. For example: SELECT SQRT(2), SQRT(4), SQRT(8); -- +--------------------+-------- -+--------------------+-- | SQRT(2) | SQRT(4) | SQRT(... 2023-11-14, 1878🔥, 0💬

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General MySQL Oracle SQL Server