Why we use triggers in mysql?
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Can a table have two primary keys?
In a table i have columns A,B,C and i have a composite index on columns A,B if so will the following query uses index or not? SELECT sal,name FROM <table_name> WHERE A=<value> AND B=<value> AND C=<value>;
What are the types of triggers in sql?
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what is difference between procedure and function, procedure and trigger?
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