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                ## 1.基本概念 ## 2.查詢數據 ### 2.1.查詢單列數據 ``` select 列名 from 表名; ``` ### 2.2.查詢多列數據 ``` select 列名1, 列名2, 列名3, ... from 表名; ``` ### 2.3.查詢所有列的數據 ``` select * from 表名; ``` 查詢前幾行數據 ``` select 列名 from 表名 limit 5; ```
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