MySQL JOIN Clause
Scenario: I have two MySQL tables. Both of them have an index on the column called "foo."
1. I run a SELECT query and use a JOIN clause naming "foo" in the two tables. I get a results set giving the intersection of the tables on "foo."
2. I remove the index from one or both of the tables and rerun the query in #1.
Will I get the same results set from the second (unindexed) SELECT? Or does the presence of an index affect the results of JOIN?
1. I run a SELECT query and use a JOIN clause naming "foo" in the two tables. I get a results set giving the intersection of the tables on "foo."
2. I remove the index from one or both of the tables and rerun the query in #1.
Will I get the same results set from the second (unindexed) SELECT? Or does the presence of an index affect the results of JOIN?
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SQL
SQL (Structured Query Language) is designed to be used in conjunction with relational database products as of a means of working with sets of data. SQL consists of data definition, data manipulation, and procedural elements. Its scope includes data insert, query, update and delete, schema creation and modification, and data access control.
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