在我们的SQL-DB中,我们的四个限制存储为单独的行。
我想将Limits作为单行,以四个Limits作为列。
的数据样子:SQL将多行作为单行返回
TABLE A
lsequence operator1 value1 operator2 value2
1 < 10.5 {NULL} {NULL}
2 >= 11.5 <= 12.5
3 >= 10.5 <= 13.5
4 > 13.5 {NULL} {NULL}
TABLE B
lsequence limittypeid
1 LowerFail
2 Pass
3 Warning
4 UpperFail
通缉返回值:
LowerFail Pass Warning UpperFail
< 10.5 >= 11.5 || <= 12.5 >= 10.5 || <= 13.5 > 13.5
随着 'limittypeid' 我得到的4个colums Case函数基地......但还是4行。
当前收益
COLUMN1 COLUMN2 COLUMN3 COLUMN4
< 10.5 ||
>= 11.5 || <= 12.5
>= 10.5 || <= 13.5
> 13.5 ||
使用的代码:
SELECT
CASE
WHEN a.limittypeid = 'LowerFail'
THEN concat (b.operator1 , ' ' , b.value1 , ' || ' , b.operator2, ' ' , b.value2)
END,
CASE
WHEN a.limittypeid = 'Pass'
THEN concat (b.operator1 , ' ' , b.value1 , ' || ' , b.operator2, ' ' , b.value2)
END,
CASE
WHEN a.limittypeid = 'Warning'
THEN concat (b.operator1 , ' ' , b.value1 , ' || ' , b.operator2, ' ' , b.value2)
END,
CASE
WHEN a.limittypeid = 'UpperFail'
THEN concat (b.operator1 , ' ' , b.value1 , ' || ' , b.operator2 , ' ' , b.value2)
END
FROM
b
INNER JOIN b.lsequence = a.lsequence
WHERE ......conditions........
我知道它必须是可行的。
使用嵌套查询 – ammcom