目录:
一、sqlserver列转行、行转列详解
二、Oracle列转行、行转列详解
三、DB2列转行、行转列详解
四、MYSQL列转行、行专列详解
五、练习数据
练习数据在文末,使用时需要修改表名,和建表语句
每次学习新语法时,我习惯性的在四种数据库中逐一练习,这个是职业习惯哈哈。虽然去年写过oracle,db2列转行文章,不过……感觉除了我没人可以看懂,附上去年文章的截图,不过说实话DB2列转行使用跟其他数据库差距还是挺大。
灵机一动,发现还可以附带可以把with函数学习了。上面都是个人感悟,现在我们一起学习Mysql Oracle sqlserv DB2列转行、行转列的使用吧。
上班的时候公司开发很惊讶说“你居然会用列转行”
一、sqlserver列转行、行转列详解
我们看下这张表,总共是26列,1547行数据
select * from water_quality
1、列转行unpivot
UNPIVOT函数的格式如下:
UNPIVOT([转换为行的列值在转换后对应的列名] for [转换为行的列名在转换后对应的列名]
in ([转换为行的列1],[转换为行的列2],[转换为行的列3],...[转换为行的列N]))
函数讲解:
- [转换为行的列值在转换后对应的列名]这个是进行列转行的列其数据值在转换为行后的列名称,就是
要转换的列对应的数据值
用什么字段表示 - [转换为行的列名在转换后对应的列名]这个是进行列转行的列其列名在转换为行后的列名称,就是
要转换的列
用什么字段表示 - [转换为行的列]这个是声明哪些列要进行列转行,就是
要转换为行的列名
逐一列出来
问题1:把PJJG后的字段转换为行
select
//NF, YF, HL, DMMC, PJJG ----这里不能单独列几个字段,一定要用select *,至于结果差异大家可以运行后体会
* from water_quality
unpivot(
// POLLUTEVALUE for CODE_POLLUTE---上面字段无中括号就报错,按照下面有中括号的格式就不报错。不知道是不是数据库不兼容
[POLLUTEVALUE] for [CODE_POLLUTE]
IN(
JCXM_PH , JCXM_RYL,JCXM_GMSYZS ,JCXM_SHXYL ,JCXM_AD ,JCXM_SYL,JCXM_HFF,JCXM_GONG ,JCXM_QIAN ,JCXM_GE ,JCXM_YLZBMHXJ ,JCXM_LUO,JCXM_FHW,JCXM_ZL ,JCXM_QHW,JCXM_LHW,JCXM_SHEN ,JCXM_HXXYL ,
JCXM_TONG ,JCXM_XIN,JCXM_XI ))
as a--------#as一定要有,没有就报错,我也不知道为什么。可能是特定的语法格式吧
[转换为行的**列值**在转换后对应的列名]对应POLLUTEVALUE
[转换为行的**列名**在转换后对应的列名]对应CODE_POLLUTE
[转换为行的列]对应JCXM_PH , JCXM_RYL,JCXM_GMSYZS ,JCXM_SHXYL ,JCXM_AD ,JCXM_SYL,JCXM_HFF,JCXM_GONG ,JCXM_QIAN ,JCXM_GE ,JCXM_YLZBMHXJ ,JCXM_LUO,JCXM_FHW,JCXM_ZL,JCXM_QHW,JCXM_LHW,JCXM_SHEN ,JCXM_HXXYL ,JCXM_TONG ,JCXM_XIN,JCXM_XI
我们看下转换后的结果
2、行转列PIVOT
PIVOT函数的格式如下
PIVOT(<聚合函数>([聚合列值]) FOR [行转列前的列名]
IN([行转列后的列名1],[行转列后的列名2],[行转列后的列名3],.......[行转列后的列名N]))
函数讲解:
- <聚合函数>就是我们使用的SUM,COUNT,AVG等Sql聚合函数,也就是行转列后计算列的聚合方式。
- [聚合列值]要进行聚合的列名
- [行转列前的列名]这个就是需要
将行转换为列的列名
。 - [行转列后的列名]这里需要声明将行的值转换为列后的列名,因为转换后的列名其实就是转换前行的值,所以上面格式中的[行转列后的列名1],[行转列后的列名2],[行转列后的列名3],......[行转列后的列名N]其实就是[行转列前的列名]每一行的值。
问题2:把CODE_POLLUTE污染物编码字段以列的方式显示
解答1:
---water_quality_temp这个表是问题1查询后保存的结果表啦
select *
from water_quality_temp
PIVOT(max(POLLUTEVALUE) FOR [CODE_POLLUTE] -----#max换成count会看见不同的结果
IN(JCXM_PH , JCXM_RYL,JCXM_GMSYZS ,JCXM_SHXYL ,JCXM_AD ,JCXM_SYL,JCXM_HFF,JCXM_GONG ,JCXM_QIAN ,JCXM_GE ,JCXM_YLZBMHXJ ,JCXM_LUO,JCXM_FHW,JCXM_ZL ,JCXM_QHW,JCXM_LHW,JCXM_SHEN ,JCXM_HXXYL ,
JCXM_TONG ,JCXM_XIN,JCXM_XI)) AS T
解答2:
-----如果没有将问题1结果报错,可以这样写
with water_quality_temp as(
select
//NF, YF, HL, DMMC, PJJG ----这里不能单独列几个字段,一定要用select *,至于结果差异大家可以运行后体会
* from water_quality
unpivot(
// POLLUTEVALUE for CODE_POLLUTE---上面字段无中括号就包括,按照下面有中括号的格式就不报错。不知道是不是不兼容
[POLLUTEVALUE] for [CODE_POLLUTE]
IN(JCXM_PH , JCXM_RYL,JCXM_GMSYZS ,JCXM_SHXYL ,JCXM_AD ,JCXM_SYL,JCXM_HFF,JCXM_GONG ,JCXM_QIAN ,JCXM_GE ,JCXM_YLZBMHXJ ,JCXM_LUO,JCXM_FHW,JCXM_ZL ,JCXM_QHW,JCXM_LHW,JCXM_SHEN ,JCXM_HXXYL ,
JCXM_TONG ,JCXM_XIN,JCXM_XI ))
as a)----#as一定要有,没有就报错
select *
from water_quality_temp
PIVOT(max(POLLUTEVALUE) FOR [CODE_POLLUTE] IN(JCXM_PH , JCXM_RYL,JCXM_GMSYZS ,JCXM_SHXYL ,JCXM_AD ,JCXM_SYL,JCXM_HFF,JCXM_GONG ,JCXM_QIAN ,JCXM_GE ,JCXM_YLZBMHXJ ,JCXM_LUO,JCXM_FHW,JCXM_ZL ,JCXM_QHW,JCXM_LHW,JCXM_SHEN ,JCXM_HXXYL ,
JCXM_TONG ,JCXM_XIN,JCXM_XI)) AS T
- <聚合函数>本例中的max
- [聚合列值]本例中的POLLUTEVALUE
- [行转**列前**的列名]本例中的CODE_POLLUTE
- [行转**列后**的列名]本例中的CXM_PH , JCXM_RYL,JCXM_GMSYZS ,JCXM_SHXYL ,JCXM_AD ,JCXM_SYL,JCXM_HFF,JCXM_GONG ,JCXM_QIAN ,JCXM_GE ,JCXM_YLZBMHXJ ,JCXM_LUO,JCXM_FHW,JCXM_ZL ,JCXM_QHW,JCXM_LHW,JCXM_SHEN ,JCXM_HXXYL ,JCXM_TONG ,JCXM_XIN,JCXM_XI
我们看下转换后的结果
二、Oracle列转行、行转列详解
1、Oracle列转行unpivot
UNPIVOT函数的格式如下:
UNPIVOT([转换为行的列名在转换后对应的列名] for [转换为行的列值在转换后对应的列名]
in ([转换为行的列1],[转换为行的列2],[转换为行的列3],...[转换为行的列N]))
函数的讲解
Oracle列转行函数的讲解跟sqlserver一样,这里就不详细介绍了,我们直接使用
我们先看下源表
select * from TJSXM.water_quality
问题1:把PJJG后的字段转换为行
select
* from TJSXM.water_quality
unpivot( POLLUTEVALUE for CODE_POLLUTE
IN(JCXM_PH , JCXM_RYL,JCXM_GMSYZS ,JCXM_SHXYL ,JCXM_AD ,JCXM_SYL,JCXM_HFF,JCXM_GONG ,JCXM_QIAN ,JCXM_GE ,JCXM_YLZBMHXJ ,JCXM_LUO,JCXM_FHW,JCXM_ZL ,JCXM_QHW,JCXM_LHW,JCXM_SHEN ,JCXM_HXXYL ,
JCXM_TONG ,JCXM_XIN,JCXM_XI ))
----和SQLSERVER区别,这里没有as
[转换为行的**列值**在转换后对应的列名]对应POLLUTEVALUE
[转换为行的**列名**在转换后对应的列名]对应CODE_POLLUTE
[转换为行的列]对应JCXM_PH , JCXM_RYL,JCXM_GMSYZS ,JCXM_SHXYL ,JCXM_AD ,JCXM_SYL,JCXM_HFF,JCXM_GONG ,JCXM_QIAN ,JCXM_GE ,JCXM_YLZBMHXJ ,JCXM_LUO,JCXM_FHW,JCXM_ZL,JCXM_QHW,JCXM_LHW,JCXM_SHEN ,JCXM_HXXYL ,JCXM_TONG ,JCXM_XIN,JCXM_XI
我们看下结果
2、Oracle行转列pivot
PIVOT函数的格式如下
PIVOT(<聚合函数>([聚合列值]) FOR [行转列前的列名]
IN('行转列前的列名值1' [行转列后的列名1],' 行转列前的列名值2' [行转列后的列名2],'行转列前的列名值3' [行转列后的列名3],.......' 行转列前的列名值n' [行转列后的列名N]))
#行转列前的列名值2=
#select distinct 行转列前的列名 from 表名
问题2:把POLLUTEVALUE污染物编码字段以列的方式显示
select *
from TJSXM.water_quality_temp
PIVOT(max(CODE_POLLUTE) FOR POLLUTEVALUE IN(---- --#POLLUTEVALUE 即要转成列的字段
'JCXM_PH' JCXM_PH,------#max(CODE_POLLUTE) 此处必须为聚合函数
'JCXM_RYL' JCXM_RYL,-----------#in () 对要转成列的每一个值指定一个列名
'JCXM_GMSYZS' JCXM_GMSYZS,
'JCXM_SHXYL' JCXM_SHXYL,
'JCXM_AD' JCXM_AD,
'JCXM_SYL' JCXM_SYL,
'JCXM_HFF' JCXM_HFF,
'JCXM_GONG' JCXM_GONG,
'JCXM_QIAN' JCXM_QIAN,
'JCXM_GE' JCXM_GE,
'JCXM_YLZBMHXJ' JCXM_YLZBMHXJ,
'JCXM_LUO' JCXM_LUO,
'JCXM_FHW' JCXM_FHW,
'JCXM_ZL' JCXM_ZL,
'JCXM_QHW' JCXM_QHW,
'JCXM_LHW' JCXM_LHW,
'JCXM_SHEN' JCXM_SHEN,
'JCXM_HXXYL' JCXM_HXXYL,
'JCXM_TONG' JCXM_TONG,
'JCXM_XIN' JCXM_XIN,
'JCXM_XI' JCXM_XI))
我们看下结果
三、DB2列转行、行转列详解
1、DB2列转行
先看下源表
select * from TJSXM.water_quality_temp
函数格式:
DB2列转行不能使用函数unpivot,也没找到相应的函数格式,带大家从案例里面体会
问题1:把PJJG后的字段转换为行
select
a.NF,a.YF,a.HL,a.DMMC,a.DMLX ,a.PJJG,q.polutcode,q.polut_value
from TJSXM.water_quality a,
TABLE (VALUES
('Ph(pH无量纲)',a.JCXM_PH),
('溶解氧',a.JCXM_RYL),
('高锰酸盐指数',a.JCXM_GMSYZS),
('生化需氧量(BOD5)',a.JCXM_SHXYL),
('氨氮',a.JCXM_AD),
('石油类(石油醚萃取)',a.JCXM_SYL),
('挥发酚',a.JCXM_HFF),
('汞',a.JCXM_GONG),
('铅',a.JCXM_QIAN),
('镉',a.JCXM_GE),
('阴离子表面活性剂',a.JCXM_YLZBMHXJ),
('铬(六价)',a.JCXM_LUO),
('氟化物(以F-计)',a.JCXM_FHW),
('总磷(以P计)',a.JCXM_ZL),
('氰化物',a.JCXM_QHW),
('硫化物',a.JCXM_LHW),
('砷',a.JCXM_SHEN),
('化学需氧量(CODcr)',a.JCXM_HXXYL),
('铜',a.JCXM_TONG),
('锌',a.JCXM_XIN),
('硒(四价)',a.JCXM_XI)
)
AS q(polutcode, polut_value)
#每个values中对应列的数据类型必须相同,值可以任意,如1,2,3,4都是整形
下面解释一下执行的过程:
核心是用table函数创建了一个表,这个表是用value实现的多行表,value实现虚表的例子:
所不同的是这里跟from子句中的一个表产生了关系,取出了表中的一列作为数据。参考文章:db2中的列转行和行转列
我们看下列转行结果:
2、DB2行转列
函数格式
很遗憾DB2行转列不能使用unpivot函数,只能用max函数。我们一起写下吧
问题2:把CODE_POLLUTE 污染物编码字段以列的方式显示
select
NF,YF,HL,DMMC,PJJG,
max(case when CODE_POLLUTE = 'JCXM_PH'then POLLUTEVALUE end) JCXM_PHJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_RYL'then POLLUTEVALUE end) JCXM_RYLJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_GMSYZS'then POLLUTEVALUE end) JCXM_GMSYZSJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_SHXYL'then POLLUTEVALUE end) JCXM_SHXYLJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_AD'then POLLUTEVALUE end) JCXM_ADJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_SYL'then POLLUTEVALUE end) JCXM_SYLJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_HFF'then POLLUTEVALUE end) JCXM_HFFJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_GONG'then POLLUTEVALUE end) JCXM_GONGJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_QIAN'then POLLUTEVALUE end) JCXM_QIANJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_GE'then POLLUTEVALUE end) JCXM_GEJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_YLZBMHXJ'then POLLUTEVALUE end) JCXM_YLZBMHXJJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_LUO'then POLLUTEVALUE end) JCXM_LUOJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_FHW'then POLLUTEVALUE end) JCXM_FHWJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_ZL'then POLLUTEVALUE end) JCXM_ZLJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_QHW'then POLLUTEVALUE end) JCXM_QHWJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_LHW'then POLLUTEVALUE end) JCXM_LHWJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_SHEN'then POLLUTEVALUE end) JCXM_SHENJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_HXXYL'then POLLUTEVALUE end) JCXM_HXXYLJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_TONG'then POLLUTEVALUE end) JCXM_TONGJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_XIN'then POLLUTEVALUE end) JCXM_XINJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_XI'then POLLUTEVALUE end) JCXM_XIJCXM_PH
from water_quality_temp ----已存在数据库中
group by NF,YF,HL,DMMC,PJJG
我们看下运行结果:
四、MYSQL列转行、行转列详解
1、MYSQL列转行
函数格式
MYSQL列转行是不能使用unpivot函数的,我在网上百度了3个小时都没找到。所以先用union all函数吧【内心很崩溃】
问题1:把PJJG后的字段转换为一行
select NF,YF,HL,DMMC,PJJG, 'JCXM_PH' CODE_POLLUTE , JCXM_PH as POLLUTEVALUE from water_quality
union select NF,YF,HL,DMMC,PJJG, 'JCXM_PH' CODE_POLLUTE, JCXM_PH as POLLUTEVALUE from water_quality
union select NF,YF,HL,DMMC,PJJG, 'JCXM_RYL' CODE_POLLUTE, JCXM_RYL as POLLUTEVALUE from water_quality
union select NF,YF,HL,DMMC,PJJG, 'JCXM_GMSYZS' CODE_POLLUTE, JCXM_GMSYZS as POLLUTEVALUE from water_quality
union select NF,YF,HL,DMMC,PJJG, 'JCXM_SHXYL' CODE_POLLUTE, JCXM_SHXYL as POLLUTEVALUE from water_quality
union select NF,YF,HL,DMMC,PJJG, 'JCXM_AD' CODE_POLLUTE, JCXM_AD as POLLUTEVALUE from water_quality
union select NF,YF,HL,DMMC,PJJG, 'JCXM_SYL' CODE_POLLUTE, JCXM_SYL as POLLUTEVALUE from water_quality
union select NF,YF,HL,DMMC,PJJG, 'JCXM_HFF' CODE_POLLUTE, JCXM_HFF as POLLUTEVALUE from water_quality
union select NF,YF,HL,DMMC,PJJG, 'JCXM_GONG' CODE_POLLUTE, JCXM_GONG as POLLUTEVALUE from water_quality
union select NF,YF,HL,DMMC,PJJG, 'JCXM_QIAN' CODE_POLLUTE, JCXM_QIAN as POLLUTEVALUE from water_quality
union select NF,YF,HL,DMMC,PJJG, 'JCXM_GE' CODE_POLLUTE, JCXM_GE as POLLUTEVALUE from water_quality
union select NF,YF,HL,DMMC,PJJG, 'JCXM_YLZBMHXJ' CODE_POLLUTE, JCXM_YLZBMHXJ as POLLUTEVALUE from water_quality
union select NF,YF,HL,DMMC,PJJG, 'JCXM_LUO' CODE_POLLUTE, JCXM_LUO as POLLUTEVALUE from water_quality
union select NF,YF,HL,DMMC,PJJG, 'JCXM_FHW' CODE_POLLUTE, JCXM_FHW as POLLUTEVALUE from water_quality
union select NF,YF,HL,DMMC,PJJG, 'JCXM_ZL' CODE_POLLUTE, JCXM_ZL as POLLUTEVALUE from water_quality
union select NF,YF,HL,DMMC,PJJG, 'JCXM_QHW' CODE_POLLUTE, JCXM_QHW as POLLUTEVALUE from water_quality
union select NF,YF,HL,DMMC,PJJG, 'JCXM_LHW' CODE_POLLUTE, JCXM_LHW as POLLUTEVALUE from water_quality
union select NF,YF,HL,DMMC,PJJG, 'JCXM_SHEN' CODE_POLLUTE, JCXM_SHEN as POLLUTEVALUE from water_quality
union select NF,YF,HL,DMMC,PJJG, 'JCXM_HXXYL' CODE_POLLUTE, JCXM_HXXYL as POLLUTEVALUE from water_quality
union select NF,YF,HL,DMMC,PJJG, 'JCXM_TONG' CODE_POLLUTE, JCXM_TONG as POLLUTEVALUE from water_quality
union select NF,YF,HL,DMMC,PJJG, 'JCXM_XIN' CODE_POLLUTE, JCXM_XIN as POLLUTEVALUE from water_quality
union select NF,YF,HL,DMMC,PJJG, 'JCXM_XI' CODE_POLLUTE, JCXM_XI as POLLUTEVALUE from water_quality
order by NF,YF,HL,DMMC,PJJG
我们看下运行结果
2、MYSQL行转列
函数格式
很遗憾MYSQL行转列不能使用unpivot函数,只能跟DB2数据库一样,只能用max函数。
问题2:把CODE_POLLUTE 污染物编码字段以列的方式显示
select
NF,YF,HL,DMMC,PJJG,
max(case when CODE_POLLUTE = 'JCXM_PH'then POLLUTEVALUE end) JCXM_PHJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_RYL'then POLLUTEVALUE end) JCXM_RYLJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_GMSYZS'then POLLUTEVALUE end) JCXM_GMSYZSJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_SHXYL'then POLLUTEVALUE end) JCXM_SHXYLJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_AD'then POLLUTEVALUE end) JCXM_ADJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_SYL'then POLLUTEVALUE end) JCXM_SYLJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_HFF'then POLLUTEVALUE end) JCXM_HFFJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_GONG'then POLLUTEVALUE end) JCXM_GONGJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_QIAN'then POLLUTEVALUE end) JCXM_QIANJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_GE'then POLLUTEVALUE end) JCXM_GEJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_YLZBMHXJ'then POLLUTEVALUE end) JCXM_YLZBMHXJJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_LUO'then POLLUTEVALUE end) JCXM_LUOJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_FHW'then POLLUTEVALUE end) JCXM_FHWJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_ZL'then POLLUTEVALUE end) JCXM_ZLJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_QHW'then POLLUTEVALUE end) JCXM_QHWJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_LHW'then POLLUTEVALUE end) JCXM_LHWJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_SHEN'then POLLUTEVALUE end) JCXM_SHENJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_HXXYL'then POLLUTEVALUE end) JCXM_HXXYLJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_TONG'then POLLUTEVALUE end) JCXM_TONGJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_XIN'then POLLUTEVALUE end) JCXM_XINJCXM_PH ,
max(case when CODE_POLLUTE = 'JCXM_XI'then POLLUTEVALUE end) JCXM_XIJCXM_PH
from water_quality_temp ----已存在数据库中
group by NF,YF,HL,DMMC,PJJG
我们看下运行结果:
五、练习数据
使用时需要数据库修改表名,和建表语句
建表语句
CREATE TABLE water_quality (
NF varchar(20) NULL,
YF varchar(20) NULL,
HL varchar(50) NULL,
DMMC varchar(50) NULL,
PJJG varchar(50) NULL,
JCXM_PH varchar(50) NULL,
JCXM_RYL varchar(50) NULL,
JCXM_GMSYZS varchar(50) NULL,
JCXM_SHXYL varchar(50) NULL,
JCXM_AD varchar(50) NULL,
JCXM_SYL varchar(50) NULL,
JCXM_HFF varchar(50) NULL,
JCXM_GONG varchar(50) NULL,
JCXM_QIAN varchar(50) NULL,
JCXM_GE varchar(50) NULL,
JCXM_YLZBMHXJ varchar(50) NULL,
JCXM_LUO varchar(50) NULL,
JCXM_FHW varchar(50) NULL,
JCXM_ZL varchar(50) NULL,
JCXM_QHW varchar(50) NULL,
JCXM_LHW varchar(50) NULL,
JCXM_SHEN varchar(50) NULL,
JCXM_HXXYL varchar(50) NULL,
JCXM_TONG varchar(50) NULL,
JCXM_XIN varchar(50) NULL,
JCXM_XI varchar(50) NULL )
插入数据
数据量太大这里给大家提供网盘。
网盘链接:https://pan.baidu.com/s/1nTMvJopi9KJFnWOEEHXmQw
提取码:msoh
六、感受
最大的感受就是MYSQL列转行、行转列太不友好了,都没函数提供。
本来可以拆分成4篇文章的,合并在一个文章啦,以后有需要在拆分吧~~~
其实不同数据库列转行、行转列区别挺明显的,当然罗如果不用函数,用方法就没什么区别啦