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• select count(1)很慢

• select count 速度慢

• select *为什么慢

• select count 1

• select count效率

• select count(id) from

• select count(1) from table

• select count 1 from

• select中count

• select count(1) into v-cnt

• select count from

• select count limit

• select count(sal)from emp

• select from count

• select count(*) from

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