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                語法形式: ``` select .... from 表名 where 查詢條件; ``` 說明: 1,查詢條件,類似php語言中的判斷條件,也就是說,where相當于if。 2,查詢條件的作用是:針對from子句的表“進行一行一行篩選”,以篩選出符合條件的行。 3,查詢條件中,可以使用很多的運算符,包括:算術運算符,比較運算符,邏輯運算符,等等。 示例: ``` where id > 10; //比較運算符 where age - 18 >= 0; //算術運算符,比較運算符 where id < 20 and age >= 18; //比較運算符,邏輯運算符 where year % 4 = 0 and year % 100 != 0 || year % 400 = 0; //算術運算符,比較運算符,邏輯運算符 ```
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