Vol. I · A Postgres HandbookTwelve chapters · · 756 queries

The Query & the Schema

A reading-room reference for writing PostgreSQL by hand — selects to window functions, with the schema in plain view.

EasyBasic SELECT

Count total number of employees

SQL

SELECT COUNT(*) AS total_employees
FROM employees;

Tested against PostgreSQL 16

Note

“COUNT(*) counts all rows including NULLs. COUNT(column) skips NULLs.