最常用的sql语句

基本语句：

select:  select * from tableName where condition and condition and ...

insert:  insert into tableName(column1, column2, ...) values(value1, value2)

delete:  delete from tableName where conditions

update: update tableName set column1=value1, column2=value2, ... where conditions

提升：

模糊查询:  select * from tableName where column like '%value%'

选择前N条记录：select top N * from tableName where condition and condition and ...

统计: select count(*) from tableName where conditions

排序:  select * from tableName where column1 like '%value%' order by column2, column3, ... desc(降序) asc(升序)

求和:  select sum(column) as name from tableName

平均:  select avg(column) as name from tableName

最大值:  select max(column) as name from tableName

最小值:  select min(column) as name from tableName