Postgres and Open Source Experts

In PostgreSQL, there are two ways to calculate/get the square of a number: the POWER() function and a user-customized logic, i.e., multiplying the number by itself.

The CITEXT data type in PostgreSQL is case-insensitive that allows us to do text comparisons without worrying about the case.

DOUBLE PRECISION data type is a floating-point data type. It offers high precision and wide storage space of 8 bytes.

The OVERLAY() function in Postgres replaces some specified characters in the given main string with another specified string.

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.