基于其他列的值,我需要有关列生成器的帮助。我有一张桌子,如下。
CREATE TABLE test1
(
`C1` INT,
`C2` VARCHAR(120),
`C3` VARCHAR(50),
`C4` VARCHAR(20),
`C5` VARCHAR(50)
);
Insert into test1 (C1,C2,C3,C4,C5) values (1071,'TEST01','51','464',null);
Insert into test1 (C1,C2,C3,C4,C5) values (1071,'TEST02','9','109',null);
Insert into test1 (C1,C2,C3,C4,C5) values (970,'TEST03','1,2','454,41',null);
Insert into test1 (C1,C2,C3,C4,C5) values (950,'TEST04','1,2','253,255,254',null);
Insert into test1 (C1,C2,C3,C4,C5) values (792,'TEST05','1,2','536','57,65,66');
输出如下:
C1 C2 C3 C4 C5
1071 TEST01 51 464
1071 TEST02 9 109
970 TEST03 1,2 454,41
950 TEST04 1,2 253,255,254
792 TEST05 1,2 536 57,65,66
现在,选择查询应显示所有记录以及其他列,例如C3_NEW,C4_NEW和C5_NEW。这些新列基于C3,C4和C5的值。
示例:如果C3具有两个值,即1,2,而C4具有454,41 那么C3_NEW应该已经基于1然后是2创建了 和C4_NEW应该基于454和41创建。因此,其他行基于值。
下面是所需的输出,我正在寻找。
C1 C2 C3 C4 C5 C3_NEW C4_NEW C5_NEW
1071 TEST02 9 109 9 109
1071 TEST01 51 464 51 464
970 TEST03 1,2 454,41 1 41
970 TEST03 1,2 454,41 1 454
970 TEST03 1,2 454,41 2 41
970 TEST03 1,2 454,41 2 454
950 TEST04 1,2 253,255,254 1 253
950 TEST04 1,2 253,255,254 1 255
950 TEST04 1,2 253,255,254 1 254
950 TEST04 1,2 253,255,254 2 253
950 TEST04 1,2 253,255,254 2 255
950 TEST04 1,2 253,255,254 2 254
792 TEST05 1,2 536 57,65,66 1 536 57
792 TEST05 1,2 536 57,65,66 1 536 65
792 TEST05 1,2 536 57,65,66 1 536 66
792 TEST05 1,2 536 57,65,66 2 536 57
792 TEST05 1,2 536 57,65,66 2 536 65
792 TEST05 1,2 536 57,65,66 2 536 66
在Oracle中,下面的查询给出所需的最终输出:
Select
C1, C2, C3, C4, C5,
decode(C3_NEW, 'NONE', NULL, C3_NEW) C3_NEW,
C4_NEW,
regexp_substr(sp_pub_sub.C5,'[^,]+',1,column_value) C5_NEW
from
(Select C1, C2, C3, C4, C5, C3_NEW,regexp_substr(sp_C3.C4,'[^,]+',1,column_value) C4_NEW
from
(select C1, C2, C3, C4, C5, regexp_substr(C3,'[^,]+',1,column_value) C3_NEW
from (select C1, C2, replace(C5, ' or ',',') as C5, replace(C3, ' or ',',') as C3, replace(C4, ' or ',',') as C4 from test1) t
,table(cast(multiset(select level from dual connect by level <= 1+length(C3) - length(replace(C3,',')) ) as sys.OdciNumberList)) ) sp_C3
,table(cast(multiset(select level from dual connect by level <= 1+length(sp_C3.C4) - length(replace(sp_C3.C4,',')) ) as sys.OdciNumberList)) ) sp_pub_sub
,table(cast(multiset(select level from dual connect by level <= 1+length(sp_pub_sub.C5) - length(replace(sp_pub_sub.C5,',')) ) as sys.OdciNumberList))
order by 1 desc,2,3,4,5,6;
现在,mysql没有多重集或级别,因此如何在mysql中获得相同的输出。请放心,因为我不是开发人员:-)
预先感谢