Postgres and Open Source Experts

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.

In PostgreSQL, the RENAME TO clause is used along with the ALTER USER or the ALTER ROLE statement to rename a user/role.

In PostgreSQL, bulk data can be inserted into a table using an INSERT INTO statement or COPY command. In Postgres, the COPY command allows us to load bulk data from one or more files.

To create a user in Postgres, specify the “CREATE USER” command followed by the user name, and after that, assign the privileges to the user using the “WITH” clause.