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What does MySQL full value match mean

2022-06-12 19:50:00 【WD Technology】

Specify specific values for all columns in the index .

EXPLAIN SELECT SQL_NO_CACHE * FROM emp WHERE emp.age=30

EXPLAIN SELECT SQL_NO_CACHE * FROM emp WHERE emp.age=30 and deptid=4

EXPLAIN SELECT SQL_NO_CACHE * FROM emp WHERE emp.age=30 and deptid=4 AND emp.name = ‘abcd

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