PostgreSQL – REVERSE Function

The REVERSE function is used to reverse the order of characters in a given string. It takes a string as an argument and returns a new string with the characters reversed. Here’s the basic syntax of the REVERSE function: REVERSE(string) Here’s an example of using the REVERSE function: SELECT REVERSE(‘Hello, World!’); — Returns ‘!dlroW ,olleH’…

PostgreSQL -CLOCK_TIMESTAMP

The clock_timestamp() function is used to retrieve the current timestamp as of the current transaction’s start time. It returns a timestamp with time zone that represents the exact time when the current transaction began. Here’s how you can use the clock_timestamp() function in PostgreSQL: SELECT clock_timestamp(); The above SQL statement will return the current timestamp,…

PostgreSQL – LOCALTIMESTAMP

The localtimestamp function is used to retrieve the current timestamp according to the time zone setting of your database session. This function returns the current date and time as a timestamp with time zone. Here’s how you can use localtimestamp in PostgreSQL: SELECT localtimestamp; The above SQL statement will return the current timestamp based on…

PostgreSQL – STATEMENT_TIMESTAMP

The statement_timestamp() function is used to retrieve the timestamp when the current statement within a transaction started. Unlike transaction_timestamp(), which gives you the timestamp when the transaction started (and remains constant throughout the transaction), statement_timestamp() provides the timestamp specific to the current SQL statement being executed. This can be useful for recording when individual statements…

PostgreSQL – TRANSACTION_TIMESTAMP

In PostgreSQL, transaction_timestamp() is a built-in function that returns the current timestamp (including both date and time) of the start of the current transaction. This function is often used in SQL queries and transactions to record the timestamp when a particular operation or transaction began. Here’s how you can use transaction_timestamp(): SELECT transaction_timestamp(); The result…