Lecture 11: DQL data query statement comprehensive case combat

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DQL data query statement comprehensive case combat

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DQL data query statement comprehensive case combat

The commonly used aggregation function example is still demonstrated according to the new crown vaccination information table created earlier.

1. Query the information of persons aged 28/29/30/31.

select * from jszx_xgymjzxxb where nl in ('28','29','30',

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