行列互转
create table test(id int,name varchar(20),quarter int,profile int)
insert into test values(1,'a',1,1000)
insert into test values(1,'a',2,2000)
insert into test values(1,'a',3,4000)
insert into test values(1,'a',4,5000)
insert into test values(2,'b',1,3000)
insert into test values(2,'b',2,3500)
insert into test values(2,'b',3,4200)
insert into test values(2,'b',4,5500)
select * from test
--行转列
select id,name,
[1] as "一季度",
[2] as "二季度",
[3] as "三季度",
[4] as "四季度",
[5] as "5"
from
test
pivot
(
sum(profile)
for quarter in
([1],[2],[3],[4],[5])
)
as pvt
create table test2(id int,name varchar(20), Q1 int, Q2 int, Q3 int, Q4 int)
insert into test2 values(1,'a',1000,2000,4000,5000)
insert into test2 values(2,'b',3000,3500,4200,5500)
select * from test2
--列转行
select id,name,quarter,profile
from
test2
unpivot
(
profile
for quarter in
([Q1],[Q2],[Q3],[Q4])
)
as unpvt
insert into test values(1,'a',1,1000)
insert into test values(1,'a',2,2000)
insert into test values(1,'a',3,4000)
insert into test values(1,'a',4,5000)
insert into test values(2,'b',1,3000)
insert into test values(2,'b',2,3500)
insert into test values(2,'b',3,4200)
insert into test values(2,'b',4,5500)
select * from test
--行转列
select id,name,
[1] as "一季度",
[2] as "二季度",
[3] as "三季度",
[4] as "四季度",
[5] as "5"
from
test
pivot
(
sum(profile)
for quarter in
([1],[2],[3],[4],[5])
)
as pvt
create table test2(id int,name varchar(20), Q1 int, Q2 int, Q3 int, Q4 int)
insert into test2 values(1,'a',1000,2000,4000,5000)
insert into test2 values(2,'b',3000,3500,4200,5500)
select * from test2
--列转行
select id,name,quarter,profile
from
test2
unpivot
(
profile
for quarter in
([Q1],[Q2],[Q3],[Q4])
)
as unpvt
sql替换字符串 substring replace
--例子1:
update tbPersonalInfo set TrueName = replace(TrueName,substring(TrueName,2,4),'**') where ID = 1
--例子2:
update tbPersonalInfo set Mobile = replace(Mobile,substring(Mobile,4,11),'********') where ID = 1
--例子3:
update tbPersonalInfo set Email = replace(Email,'chinamobile','******') where ID = 1
update tbPersonalInfo set TrueName = replace(TrueName,substring(TrueName,2,4),'**') where ID = 1
--例子2:
update tbPersonalInfo set Mobile = replace(Mobile,substring(Mobile,4,11),'********') where ID = 1
--例子3:
update tbPersonalInfo set Email = replace(Email,'chinamobile','******') where ID = 1
SQL查询一个表内相同纪录 having
select * from 表 where ID in (
select ID from 表 group by ID having sum(1)>1))
select ID from 表 group by ID having sum(1)>1))
select * from 表 where ID1+ID2+ID3 in
(select ID1+ID2+ID3 from 表 group by ID1,ID2,ID3 having sum(1)>1))
(select ID1+ID2+ID3 from 表 group by ID1,ID2,ID3 having sum(1)>1))
--方法1:
SELECT *FROM zy_bho a WHERE EXISTS
(SELECT 1 FROM zy_bho WHERE [PK] <> a.[PK] AND ZYH = a.ZYH)
--方法2:
select a.* from zy_bho a join zy_bho b
on (a.[pk]<>b.[pk] and a.zyh=b.zyh)
--方法3:
select * from zy_bbo where zyh in
(select zyh from zy_bbo group by zyh having count(zyh)>1)
--其中pk是主键或是 unique的字段。
SELECT *FROM zy_bho a WHERE EXISTS
(SELECT 1 FROM zy_bho WHERE [PK] <> a.[PK] AND ZYH = a.ZYH)
--方法2:
select a.* from zy_bho a join zy_bho b
on (a.[pk]<>b.[pk] and a.zyh=b.zyh)
--方法3:
select * from zy_bbo where zyh in
(select zyh from zy_bbo group by zyh having count(zyh)>1)
--其中pk是主键或是 unique的字段。