Creates indexes on columns in tables. Restriction: You cannot use CREATE INDEX on a table accessed via an engine that does not support UPDATE processing. an IN subquery where the column in the inner ...

My table is as follows: I have a candidate key using columns A-E. This is too many, but column A is very helpful to keep in each table that references it, so I want to generate a surrogate key using ...

MySQL table primary keys and unique indexes prevent multiple rows with the same index from being added to the table. If you try to insert a duplicate row with a ...