This is a list of complex SQL Queries I have practiced. - SQL-Queries/Complex Queries 4 - Date Functions.sql at main · Chaitanyaprasad60/SQL-Queries ...

In R, the sqldf package lets you run SQL queries on an R data frame, and that’s what I’ll use in this example. There’s a similar sqldf library in Python.

Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement. It’s sometimes difficult to know which SQL syntax to use when ...