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sql语句组合

发布时间: 2023-01-15 21:42:30

sql语句合并

你都写成xx你不会看晕吗?

insertintoxxx(xx,yy,zz)selectxx,yy,idfromyyywhereid=5

❷ 多条sql语句如何拼接

SQL语句拼接一般使用【union all】和【union】

两者的区别是:

【union all】:显示多条语句里的全部记录;

【union】:显示多条语句里的不重复的记录,也就是有DIstinct的功效;


【union all】示例:

select'2016-02-06'date_timeunionall
select'2016-02-14'unionall
select'2016-06-12'unionall
select'2016-09-18'unionall
select'2016-10-09'unionall
select'2016-10-09'

结果为6行


【union】示例:

select'2016-02-06'date_timeunionall
select'2016-02-14'unionall
select'2016-06-12'unionall
select'2016-09-18'unionall
select'2016-10-09'unionall
select'2016-10-09'

结果为5行

❸ sql语句 组合问题

你确定是所有组合吗?比如你有3个值a,b,c,那么所有组合就是3+3^2+3^3=39条记录。这其实就是笛卡尔积啊。

selecta,bfromtestunionall--一个的
selectt1.a+t2.a,t1.b+','+t2.bfromtest05t1,testt2unionall--二个的
selectt1.a+t2.a+t3.a,t1.b+','+t2.b+','+t3.bfromtestt1,testt2,testt3--三个的

结果如下:

❹ sql语句 两条sql语句怎么合并在一起

方法/步骤

  • 我用Toad做演示,我先新建两张table,

    create table #AA(ID int,name nvarchar(10),age int)

    create table #BB(ID int,name nvarchar(10),age int )

❺ 插入和查询SQL语句组合

insert into table_a (aaa,bbb,ccc)
SELECT 111
,222
,id
FROM table_b

❻ 这两个sql 语句怎么组合在一起

select * from ( select top 20 ,(select count(*) from dp_Comments where dp_Comments.c_TextID= dp_Gossip.g_ID) as cnt from dp_Gossip ) as stas inner join (select top 20 * from (select ROW_NUMBER() OVER (order by g_PublishTime desc) AS RowNumber,* from dp_Gossip)A) as stf where stf.RowNumber > 20*(2-1)
order by stas.cnt desc

❼ 急求 SQL 组合语句

select * from 表名称 where l_customer+l_year+l_mouth+convert(varchar,l_amt) in (select l_customer+l_year+l_mouth+convert(varchar,l_amt) FROM (select l_customer,l_year,l_mouth,max(l_amt) l_amt from 表名称 group by l_customer,l_year,l_mouth) as a)

❽ 如何把两条SQL语句合并

insert into sum1(fullwork, parttime) select count(staffKind='全职'), count(staffKind='兼职') from basicInfo