我们现在学习下几个基本的sql语句,万变不离其宗,把基础弄扎实了其它的就很容易了。希望能帮到你。
方法/步骤
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选择:select * from table where 范围
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插入:insert into table(field1,field2) values(value1,value2)
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删除:delete from table where 范围
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更新:update table set field1=value1 where 范围
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查找:select * from table where field1 like ’%value1%’
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排序:select * from table order by field1,field2 [desc]
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总数:select count as totalcount from table
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求和:select sum(field1) as sumvalue from table
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平均:select avg(field1) as avgvalue from table
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最大:select max(field1) as maxvalue from table
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最小:select min(field1) as minvalue from table
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例: SELECT TOP 20 * FROM table 意思是:从table中查询前 20 项的全部内容 *可以用table中的内容表示 意思是:从table中查询前 20 项'某一项'的内容 SELECT SUM(grade) as total,average(grade) as average FROM table GROUP BY class 意思是:以班级为单位,查询这个班的总成绩和平均成绩 UPDATE table SET age=age+10 意思是:将 table 中所有人的年龄增加10岁