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mysql alter table add index

ALTER TABLE TABLE_NAME ADD INDEX `index_name` (`column_name`)
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how to add an index to an existing table (mysql)

## Adding an Index to Existing Table
CREATE INDEX indexName ON tableName (ID, LName, FName, LOC);

## Adding an Index to Existing Table with Primary Key
CREATE UNIQUE INDEX indexName ON tableName (ID, LName, FName, LOC);
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