oracle行轉(zhuǎn)列與列轉(zhuǎn)行的幾種方式匯總
更新時間：2023年05月29日 09:12:30 作者：SUMMERENT
最近項目需要進行行轉(zhuǎn)列,經(jīng)過上網(wǎng)查找到了一些解決方法,分享給大家,這篇文章主要給大家介紹了關(guān)于oracle行轉(zhuǎn)列與列轉(zhuǎn)行的幾種方式,文中通過圖文以及實例代碼介紹的非常詳細,需要的朋友可以參考下
1、準備數(shù)據(jù)：REST表
-- 創(chuàng)建表REST
CREATE TABLE REST (
"ID" NUMBER,
"AMOUNT" NUMBER(19,0),
"MONTH" VARCHAR2(255 BYTE)
);
--執(zhí)行添加數(shù)據(jù)語句
INSERT INTO "CERPAWCSADM"."REST" VALUES ('1', '100', 'Jan');
INSERT INTO "CERPAWCSADM"."REST" VALUES ('1', '100', 'Feb');
INSERT INTO "CERPAWCSADM"."REST" VALUES ('1', '66', 'Mar');
INSERT INTO "CERPAWCSADM"."REST" VALUES ('1', '77', 'Jun');
INSERT INTO "CERPAWCSADM"."REST" VALUES ('1', '88', 'Dec');
INSERT INTO "CERPAWCSADM"."REST" VALUES ('1', '12', 'Aug');
INSERT INTO "CERPAWCSADM"."REST" VALUES ('2', '22', 'Feb');
INSERT INTO "CERPAWCSADM"."REST" VALUES ('2', '33', 'Apr');
INSERT INTO "CERPAWCSADM"."REST" VALUES ('2', '232', 'Jul');
INSERT INTO "CERPAWCSADM"."REST" VALUES ('2', '43', 'Sep');
INSERT INTO "CERPAWCSADM"."REST" VALUES ('2', '544', 'Oct');
INSERT INTO "CERPAWCSADM"."REST" VALUES ('2', '65', 'Nov');2、查詢數(shù)據(jù)
3、行轉(zhuǎn)列
方式1：使用 case when then方式
case 條件
when 值1 then 返回值1
when 值2 then 返回值2
..........
else 默認值
end
-- 使用case when 方式 SELECT id, sum( CASE month WHEN 'Jan' THEN amount ELSE 0 END ) AS Jan_amount, sum( CASE month WHEN 'Feb' THEN amount ELSE 0 END ) AS Feb_amount, sum( CASE month WHEN 'Mar' THEN amount ELSE 0 END ) AS Mar_amount, sum( CASE month WHEN 'Apr' THEN amount ELSE 0 END ) AS Apr_amount, sum( CASE month WHEN 'May' THEN amount ELSE 0 END ) AS May_amount, sum( CASE month WHEN 'Jun' THEN amount ELSE 0 END ) AS Jun_amount, sum( CASE month WHEN 'Jul' THEN amount ELSE 0 END ) AS Jul_amount, sum( CASE month WHEN 'Aug' THEN amount ELSE 0 END ) AS Aug_amount, sum( CASE month WHEN 'Sep' THEN amount ELSE 0 END ) AS Sep_amount, sum( CASE month WHEN 'Oct' THEN amount ELSE 0 END ) AS Oct_amount, sum( CASE month WHEN 'Nov' THEN amount ELSE 0 END ) AS Nov_amount, sum( CASE month WHEN 'Dec' THEN amount ELSE 0 END ) AS Dec_amount FROM REST GROUP BY id
case when 另一種方式：
case when 條件 = 值1 then 返回值1
case when 條件 = 值1 then 返回值1
else 默認值
end
SELECT id, sum( CASE WHEN month ='Jan' THEN amount ELSE 0 END ) AS Jan_amount, sum( CASE WHEN month = 'Feb' THEN amount ELSE 0 END ) AS Feb_amount, sum( CASE WHEN month = 'Mar' THEN amount ELSE 0 END ) AS Mar_amount, sum( CASE WHEN month = 'Apr' THEN amount ELSE 0 END ) AS Apr_amount, sum( CASE WHEN month = 'May' THEN amount ELSE 0 END ) AS May_amount, sum( CASE WHEN month = 'Jun' THEN amount ELSE 0 END ) AS Jun_amount, sum( CASE WHEN month = 'Jul' THEN amount ELSE 0 END ) AS Jul_amount, sum( CASE WHEN month = 'Aug' THEN amount ELSE 0 END ) AS Aug_amount, sum( CASE WHEN month = 'Sep' THEN amount ELSE 0 END ) AS Sep_amount, sum( CASE WHEN month = 'Oct' THEN amount ELSE 0 END ) AS Oct_amount, sum( CASE WHEN month = 'Nov' THEN amount ELSE 0 END ) AS Nov_amount, sum( CASE WHEN month = 'Dec' THEN amount ELSE 0 END ) AS Dec_amount FROM REST GROUP BY id
結(jié)果為：
方式2： 使用 decode函數(shù)
decode函數(shù)： DECODE(條件, 值1, 返回值1, 值2,返回值2, 值3,返回值3, . . . else 缺省值)
含義：if 條件 = 值1 then 返回值1 elsif 條件 = 值2 then 返回值2 else (缺省值) endif
-- 使用decode函數(shù) SELECT id, sum( decode( month, 'Jan', amount, 0 ) ) Jan_amount, sum( decode( month, 'Feb', amount, 0 ) ) Feb_amount, sum( decode( month, 'Mar', amount, 0 ) ) Mar_amount, sum( decode( month, 'Apr', amount, 0 ) ) Apr_amount, sum( decode( month, 'May', amount, 0 ) ) May_amount, sum( decode( month, 'Jun', amount, 0 ) ) Jun_amount, sum( decode( month, 'Jul', amount, 0 ) ) Jul_amount, sum( decode( month, 'Aug', amount, 0 ) ) Aug_amount, sum( decode( month, 'Sep', amount, 0 ) ) Sep_amount, sum( decode( month, 'Oct', amount, 0 ) ) Oct_amount, sum( decode( month, 'Nov', amount, 0 ) ) Nov_amount, sum( decode( month, 'Dec', amount, 0 ) ) Dec_amount FROM REST GROUP BY id
結(jié)果和方式1一樣
方式3：使用pivot函數(shù)
pivot
(
<聚合函數(shù)>(要聚合的列)
for <要轉(zhuǎn)換的列> in (要轉(zhuǎn)換的列值 as 要轉(zhuǎn)換成的列名)
)
SELECT * FROM REST pivot ( SUM(amount) FOR month IN ( 'Jan' AS Jan_amount, 'Feb' AS Feb_amount, 'Mar' AS Mar_amount, 'Apr' AS Apr_amount, 'May' AS May_amount, 'Jun' AS Jun_amount, 'Jul' AS Jul_amount, 'Aug' AS Aug_amount, 'Sep' AS Sep_amount, 'Oct' AS Oct_amount, 'Nov' AS Nov_amount, 'Dec' AS Dec_amount ) );
結(jié)果為：這個結(jié)果會發(fā)現(xiàn)，如果數(shù)據(jù)為空沒有賦值為0
下面這個方法解決null 轉(zhuǎn)為0 問題
SELECT NVl(Jan_amount,0) Jan_amount, NVl(Feb_amount,0) Feb_amount, NVl(Mar_amount,0) Mar_amount, NVl(Apr_amount,0) Apr_amount, NVl(May_amount,0) May_amount, NVl(Jun_amount,0) Jun_amount, NVl(Jul_amount,0) Jul_amount, NVl(Aug_amount,0) Aug_amount, NVl(Sep_amount,0) Sep_amount, NVl(Oct_amount,0) Oct_amount, NVl(Nov_amount,0) Nov_amount, NVl(Dec_amount,0) Dec_amount FROM REST pivot ( SUM(amount) FOR month IN ( 'Jan' AS Jan_amount, 'Feb' AS Feb_amount, 'Mar' AS Mar_amount, 'Apr' AS Apr_amount, 'May' AS May_amount, 'Jun' AS Jun_amount, 'Jul' AS Jul_amount, 'Aug' AS Aug_amount, 'Sep' AS Sep_amount, 'Oct' AS Oct_amount, 'Nov' AS Nov_amount, 'Dec' AS Dec_amount ) );
結(jié)果和方式1一樣：
4、列轉(zhuǎn)行
在上述pivot 方法的原sql語句上再加上unpivot函數(shù)，將列再轉(zhuǎn)為行，在unpivot函數(shù)中，amount：表示由列轉(zhuǎn)換為行后的數(shù)據(jù)
month：表示由列轉(zhuǎn)換為行后的列名
select * from REST pivot (sum(amount) for month in ( 'Jan' AS Jan_amount, 'Feb' AS Feb_amount, 'Mar' AS Mar_amount, 'Apr' AS Apr_amount, 'May' AS May_amount, 'Jun' AS Jun_amount, 'Jul' AS Jul_amount, 'Aug' AS Aug_amount, 'Sep' AS Sep_amount, 'Oct' AS Oct_amount, 'Nov' AS Nov_amount, 'Dec' AS Dec_amount )) unpivot ( amount for month in(Jan_amount,Feb_amount,Mar_amount,Apr_amount,May_amount,Jun_amount,Jul_amount,Aug_amount,Sep_amount,Oct_amount,Nov_amount,Dec_amount));
結(jié)果為：
5、直接使用unpivot函數(shù) --列轉(zhuǎn)行
準備數(shù)據(jù)：TEST表
CREATE TABLE TEST (
"ID" NUMBER(12,0) NOT NULL,
"JAN" VARCHAR2(255 BYTE),
"FEB" VARCHAR2(255 BYTE),
"MAR" VARCHAR2(255 BYTE),
"APR" VARCHAR2(255 BYTE),
"MAY" VARCHAR2(255 BYTE),
"JUN" VARCHAR2(255 BYTE),
"JUL" VARCHAR2(255 BYTE),
"AUG" VARCHAR2(255 BYTE),
"SEP" VARCHAR2(255 BYTE),
"OCT" VARCHAR2(255 BYTE),
"NOV" VARCHAR2(255 BYTE),
"DEC" VARCHAR2(255 BYTE)
);
-- 插入數(shù)據(jù)
INSERT INTO "CERPAWCSADM"."TEST" VALUES ('1', '33', '2', '3', '4', '5', '6', '7', '8', '9', '99', '8', '6');
INSERT INTO "CERPAWCSADM"."TEST" VALUES ('2', '22', '3', '4', '6', '5', '7', '0', '7', '22', '21', '343', '76');
INSERT INTO "CERPAWCSADM"."TEST" VALUES ('3', '88', '3', '4', '5', '7', '9', '7', '2', '2', '231', '56', '78');查詢出的數(shù)據(jù)
列轉(zhuǎn)行sql
SELECT * FROM TEST unpivot ( amount for month in(JAN,FEB,MAR,APR,MAY,JUN,JUL,AUG,SEP,OCT,NOV,DEC));
結(jié)果為：
總結(jié)
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