What are the basic rules to be followed when you are using SQL SET Operators?

Rules: Number of columns in all the result sets should be matched(same). Respective data types should be matched between all the result sets.

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SQL – A database language

SQL SQL Stands for Structured Query Language. It is a programming language to interact with databases. By executing SQL queries, we can Access, Insert, Update and Delete the data from databases. In earlier 1970’s, Donald D. Chamberlin and Raymond F. Boyce developed

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CODD Rules

CODD Rules Edgar F. Codd, proposed thirteen rules (0 to 12) to define what is require d from a DBMS in order for it to be considered relational. Currently there is no commercial database management system which fully satisfies all the CODD’s rules.

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