General MySQL Oracle SQL Server

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Removed: DES_ENCRYPT() - DES Data Encryption
How to encrypt data with the DES (Data Encryption Standard) algorithm using the DES_ENCRYPT() function? DES_ENCRYPT(clear, key) is a MySQL built-in function that encrypts data with the DES (Data Encryption Standard) algorithm. Note that DES_ENCRYPT() is no longer supported. It was: Introduced MySQL ... 2024-10-14, 2209🔥, 0💬

LAST_VALUE() - Last Value of Result Set Window
How to obtain the last value of a field expression in the current result set window using the LAST_VALUE() function? LAST_VALUE(exp) is a MySQL built-in window function that returns the last value of a field expression in the current result set window. For example: SELECT help_topic_id AS tip, help_... 2024-09-28, 2197🔥, 0💬

RANK() - Vale Rank of Sorted Values
How to calculate the value rank of the sorting field expression in the current result set window using the RANK() function? RANK(n) is a MySQL built-in window function that calculates the value rank of the sorting field expression in the current result set window. For example: SELECT help_topic_id A... 2024-09-12, 2186🔥, 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, 2171🔥, 0💬

INET_ATON() - IP Address String to Number
How to convert an IP address from string format to number using the INET_ATON() function? INET_ATON(ip) is a MySQL built-in function that converts an IP address from string format to number. It uses the following conversion formula: INET_ATON('p 1 .p 2 .p 3 .p 4 ') = INET_ATON(p 1 ×256 3 + p 2 ×256 ... 2026-07-13, 2138🔥, 0💬

Removed: DES_DECRYPT() - DES Data Decryption
How to decrypt data with the DES (Data Encryption Standard) algorithm using the DES_DECRYPT() function? DES_DECRYPT(cipher, key) is a MySQL built-in function that decrypts data with the DES (Data Encryption Standard) algorithm. Note that DES_DECRYPT() is no longer supported. It was: Introduced MySQL... 2024-10-14, 2131🔥, 0💬

BENCHMARK() - Repeating Expression Evaluation
How to evaluate an expression repeatedly for benchmark testing using the BENCHMARK() function? BENCHMARK(count, exp) is a MySQL built-in function that evaluates an expression repeatedly for benchmark testing and returns 0. For example: SELECT BENCHMARK(1000000, AES_ENCRYPT('hello','goodbye') );-- +-... 2024-07-17, 2123🔥, 2💬

💬 2024-07-17 Iqra Technology: This is a great overview of the `BENCHMARK()` function in MySQL! Your examples clearly illustrate how it can be used to evaluate...

Removed MySQL Functions
Where to find answers to frequently asked questions about Removed MySQL Built-in Functions? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com team about Removed MySQL Built-in Functions: Removed: ENCODE() - Encoding Data with Password Removed: DECODE() - Decodi... 2024-10-14, 2107🔥, 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, 2104🔥, 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, 2096🔥, 0💬

Removed: PASSWORD() - Generating Password Hash
How to convert a password into a hash value with the default hashing algorithm using the PASSWORD() function? PASSWORD(password) is a MySQL built-in function that converts a password into a hash value with the default hashing algorithm. Note that PASSWORD() is no longer supported. It was: Introduced... 2024-05-15, 2095🔥, 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, 2081🔥, 0💬

Removed: DECODE() - Decoding Data with Password
How to decode a byte sequence generated from the ENCODE() function using the DECODE() function? DECODE(cipher, pass) is a MySQL built-in function that encodes a byte sequence generated from the ENCODE() function. Note that DECODE() is no longer supported. It was: Introduced MySQL 4.0. Removed in MyS... 2024-10-14, 2076🔥, 0💬

COALESCE() - Finding First Non-NULL Value
How to find the first non-NULL value from a list using the COALESCE() function? COALESCE(val1, val2, ...) is a MySQL built-in function that returns the first non-NULL value from a given list of values. For example: SELECT COALESCE(NULL, 'FYI', NULL, 3.14); -- +----------------------------- ------+--... 2026-03-22, 2073🔥, 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, 2070🔥, 0💬

LEAD() - N-Row after Current Row within Window
How to evaluate a field expression on n-row after the current row in the current result set window using the LEAD() function? LEAD(exp, n, default) is a MySQL built-in window function that evaluates a field expression on n-row after the current row in the current result set window. For example: SELE... 2024-09-28, 2060🔥, 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, 2039🔥, 0💬

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, 2036🔥, 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, 2028🔥, 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, 2024🔥, 0💬

INET6_ATON() - IPv6 Address String to Number
How to convert an IPv6 address from string format to number using the INET6_ATON() function? INET6_ATON(ip) is a MySQL built-in function that converts an IPv6 address from string format to number. But an IPv6 number is too big to be represented in decimal digits. So it is stored as a byte sequence, ... 2026-04-13, 2015🔥, 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, 2012🔥, 0💬

CONNECTION_ID() - Thread ID of Current Connection
How to obtain the connection ID of the current connection using the CONNECTION_ID() function? CONNECTION_ID() is a MySQL built-in function that returns the connection ID of the current connection. The connection ID is also referred as thread ID or process ID. For example: SELECT CONNECTION_ID(); -- ... 2024-07-15, 2011🔥, 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, 2010🔥, 0💬

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General MySQL Oracle SQL Server