更新: update table1 set field1=value1 where 范围
查找: select * from table1 where field1 like '%value1%' (所有包含'value1'这个模式的字符串)
排序: select * from table1 order by field1,field2 [desc]
求和: select sum(field1) as sumvalue from table1
平均: select avg(field1) as avgvalue from table1
最大: select max(field1) as maxvalue from table1
最小: select min(field1) as minvalue from table1[separator]
sql 语句
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