Postgres and Open Source Experts

In PostgreSQL, the regexp_match() function matches a regular expression in a specified main string. This function takes in the string and the regular expression to be matched along with a flag and returns the first matched substring from the main string.

Let’s get into the details of the regexp_match() function.

How Does PostgreSQL regexp_match() Function Do?

The regexp_match() function works almost the same as the regexp_matches() function. It basically returns …

In Postgresql, the regexp_split_to_array() function is used to split the specified string into an array using the specified POSIX regular expressions

The make_date () function takes arguments, then creates and returns a date with them. The make_time() function takes arguments, then creates and returns a time without a time zone.

The regexp_split_to_table() function takes the string, the regexp, and the flag(if any) as arguments and returns a table column that contains the string characters with the Regexp as separators.

Array_position() function gives the first occurrence of an element while the Array_positions() function gives all the occurrences of an element in an array.

The array_dims() gives out the information about the dimensions of an array. The array_dims() takes an array as a parameter and returns text that shows array dimensions.

To enable a trigger in PostgreSQL, the “ALTER TABLE” statement is used with the “DISABLE TRIGGER” clause. We need to specify the name of the trigger associated with a particular table in case of enabling one trigger.

In PostgreSQL, different methods are used to list all the triggers associated with a database, such as "pg_trigger catalog", "psql" command, and SQL queries.

In PostgreSQL, a trigger can be dropped from the table by specifying the name of the trigger and the name of the table to which it is associated.

In PostgreSQL, the "ALTER TABLE" with the "DISABLE TRIGGER" clause is used to disable a trigger. We need to specify the name of the trigger associated with a particular table in case of disabling one trigger.