sql server 新語法 收藏

一、行轉列 PIVOT函數，行轉列，列轉換UNPIVOT

 select brlx as '姓名',西藥費,中成藥,中草藥 from cc_mzjzzjb_zy a
PIVOT
(
max(a.ysje) for a.zy in(西藥費,中成藥,中草藥)
)b;

select * from ShoppingCart as C PIVOT(count(TotalPrice) FOR [Week] IN([1],[2],[3],[4],[5],[6],[7])) AS T 

https://www.cnblogs.com/linJie1930906722/p/6036714.html
https://www.cnblogs.com/wlsandwho/p/4423956.html
https://www.cnblogs.com/ylbtech/p/8028808.html
https://www.cnblogs.com/sword-successful/p/4814840.html

2.SQL XML

左外鏈接  LEFT OUTER JOIN 

 

select dm,ks from  c_dept for xml path

select dm,ks from  c_dept for xml path('Dept')

select dm,ks from  c_dept for xml raw

select dm,ks from  c_dept for xml auto

 

字符串解析爲表

https://www.cnblogs.com/lanyubaicl/p/5671966.html

 

特殊字符用nvarchar類型，插入的時候字符常量前面加N

create table TbN( itemno NVARCHAR(50));

INSERT INTO TbN(itemno) VALUES (N'A02.201†'  );

 

比較簡單的生成多行數據相似select union

    SELECT * FROM (VALUES(1),(2),(3)) AS V(A)

A
1
2
3

字符串拼接分解

 SELECT stuff( (SELECT ',' + turnOffice  FROM (
  select ( select dm from c_dept  t where t.ks=items) as turnOffice  FROM dbo.[Split_StrByDelimiter](REPLACE( '內一科->內三科->外一科->骨科->婦科','->',','),',')
  ) A FOR XML PATH('')),1,1,'')  as turnOffice

 

https://blog.csdn.net/sqlserverdiscovery/article/details/79187307

SQL Server 2016新增了string_split函數，專門用來拆分字符串。

SQL Server 2017RTM版，新增函數string_agg