SQL Querying Multiple Tables: Difference between revisions
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=Overview= | =Overview= | ||
More than one table can be used in a <code>[[SQL_SELECT#Querying_Multiple_Tables|FROM]]</code> query clause, and when that happens, it is said that the query performs a '''join'''. | More than one table can be used in a <code>[[SQL_SELECT#Querying_Multiple_Tables|FROM]]</code> query clause, and when that happens, it is said that the query performs a '''join'''. | ||
=Join Condition= | =Join Condition= | ||
Revision as of 19:57, 23 May 2024
External
Internal
Overview
More than one table can be used in a FROM query clause, and when that happens, it is said that the query performs a join.
Join Condition
If more than one table appears in the FROM clause, then the condition used to link the tables must be included as well. This is the ANSI-approved method. of joining multiple tables, and it is the most portable across various database servers.
Foreign key