Practical extension of some knowledge in sql tutorial - Code World

Practical extension of some knowledge in sql tutorial

Others 2022-04-27 20:50:35 views: 0

1. SELECT cst_name FROM `cst_customer` union all SELECT cst_name FROM `cutomer`; display all, duplicates are also displayed

Removed all duplicates will not be displayed, even if there are multiple duplicate data in a table, only one will be displayed

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