MySQL 基本语句记录

-- 查询

select column1，column2 from table

select column1，column2 from table where id = 1

-- 查询：去掉某字段重复项，结果为这个字段

SELECT DISTINCT (column) FROM table

-- 查询：[b]去掉某字段重复项，结果可指定字段[/b]

select * from tablegroup by column

-- 内连接查询

select * from table1,table2 where table1.id = table2.id

select * from table1 inner join table2 on table1.id = table2.id

-- 左右连接查询

select * from table1 right join table2 on table1.id = table2.id

select * from table1 left join table2 on table1.id = table2.id

-- 全连接查询

select * from table1 right join table2 on table1.id = table2.id

union

select * from table1 left join table2 on table1.id = table2.id

-- 限制查询

select * from table1 limit 0,5

------------------------------------------------------------------------------------------------------------

-- 插入

insert into table (column1，column2) values (column_value1，column_value2)

------------------------------------------------------------------------------------------------------------

-- 更新

update table set column1 = 'column_value1'，column2 = 'column_value2' where id = 1

------------------------------------------------------------------------------------------------------------

-- 删除

delete from table where id = 1

------------------------------------------------------------------------------------------------------------

-- 排序

select * from table1 order by id

select * from table2 order by id desc

------------------------------------------------------------------------------------------------------------

-- 统计

select max(id) from table1

select min(id) from table1

select sum(id) from table1

select avg(id) from table1

select count(id) from table1 where pid = 1

select count(id) from table1 where table1.pid = table2.pid group by table1.pid

------------------------------------------------------------------------------------------------------------

-- 使用select结果语句创建新表

CREATE TABLE new_table (SELECT * FROM old_table);

CREATE TABLE box_total(

select pathway,pathwayName

FROM (

select pathway,pathwayName from box_human

UNION

select pathway,pathwayName from box_monkey

UNION

SELECT pathway,pathwayName from box_mouse

UNION

SELECT pathway,pathwayName from box_ox

UNION

SELECT pathway,pathwayName from box_pig

UNION

SELECT pathway,pathwayName from box_rat

order by pathway

) as TB

)