The rtrim function is used to remove characters from the right end (beginning) of a string. It takes two arguments: the input string and a list of characters to be removed from the right side of the input string. Here’s the syntax for the rtrim function: rtrim(input_string, characters_to_remove) where input_string is the string from which…
The ltrim function is used to remove characters from the left end (beginning) of a string. It takes two arguments: the input string and a list of characters to be removed from the left side of the input string. Here’s the syntax for the ltrim function: ltrim(input_string, characters_to_remove) where The ltrim function will return a…
The REPEAT function is used to repeat a string a specified number of times and concatenate the repetitions together to form a longer string. It takes two arguments: the string you want to repeat and the number of times you want to repeat it. Here’s the basic syntax of the REPEAT function: REPEAT(string, count) Here’s…
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’…
The LOWER function is used to convert all characters in a given string to lowercase. It takes a string as an argument and returns a new string where all alphabetic characters have been converted to their lowercase equivalents. Here’s the basic syntax of the LOWER function: LOWER(string) Here’s an example of using the LOWER function:…
The UPPER function is used to convert all characters in a given string to uppercase. It takes a string as an argument and returns a new string where all alphabetic characters have been converted to their uppercase equivalents. Here’s the basic syntax of the UPPER function: UPPER(string) Here’s an example of using the UPPER function:…
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,…
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…
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…
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…