Postgres and Open Source Experts

The TRUNC() function trims the whole fractional part or up to specified precision, while the ROUND() function rounds the input number to the nearest integer/specified fractional places.

PostgreSQL allows us to create a string array using one of three data types: CHAR, VARCHAR, and TEXT. Once an array is created, various operations can be performed on that array.

ARRAY_REMOVE() function accepts an array and a specific number as arguments and deletes all the occurrences of that particular number from the input array.

In PostgreSQL, the UPDATE statement must be executed with the semi-colon-separated syntax to modify multiple rows with different values.

The ARRAY_REPLACE() is an inbuilt array function in Postgres that allows us to replace all the occurrences of an array element with a new element.

Pattern matching in PostgreSQL is performed using wildcards. PostgreSQL offers two wildcards represented with a percentage sign “%” and an underscore sign “_”.

The STRING_TO_ARRAY() function accepts a string as the first argument, splits it into array elements, and concatenates the array elements using a delimiter/separator.

ARRAY_CAT() is another very convenient function in Postgres that is used to concatenate two arrays. It accepts two arrays as arguments and retrieves a concatenated array.

In PostgreSQL, the WHERE clause allows us to filter the result set retrieved by the UPDATE, SELECT, or DELETE query. The WHERE clause filters the data based on a specific condition or several conditions.

In PostgreSQL, several syntaxes can be used to insert data into an array, such as using the ARRAY keyword with square brackets “[]” or curly braces enclosed within single quotes.