Oracle SQL：将当前行和前两行的嵌套条件 excel 转换为 SQL
Oracle SQL: Convert excel nested if condition on Current row and previous two rows to SQL
我有一个带有嵌套 IF 条件的 excel 公式，它将当前行值与紧邻的前一行以及前一行与来自同一列的前第二行值进行比较。
公式：
=IF(B8<>B7,IF(B7<>B6,B6,B7),B8)
已尝试以下查询，但出现错误 "ORA-00920: 无效的关系运算符"
select MYTABLE.*,
CASE WHEN MSYMBOL over (order by MDATE) <> lag(MSYMBOL,1) over (order by MDATE)
THEN CASE
WHEN lag(MSYMBOL,1) over (order by MDATE) <> lag(MSYMBOL,2) over (order by MDATE)
THEN lag(MSYMBOL,2) over (order by MDATE)
ELSE lag(MSYMBOL,1) over (order by MDATE)
END,
ELSE MSYMBOL over (order by MDATE)
END as FLAG
from MYTABLE
Table 创建、插入语句和查询在此 link DB<>FIDDLE.
中更新
感谢对此的任何帮助。提前致谢。
谢谢，
里查
MSYMBOL over (order by MDATE) 无效，您只想使用 MSYMBOL.- 第一个
END. 后多了一个逗号
- 此外，
NULL <> something 永远不是真的，需要考虑到这一点。
您可以使用：
select MYTABLE.*,
CASE
WHEN MSYMBOL <> lag(MSYMBOL,1) over (order by MDATE)
OR (MSYMBOL IS NULL AND lag(MSYMBOL,1) over (order by MDATE) IS NOT NULL)
OR (MSYMBOL IS NOT NULL AND lag(MSYMBOL,1) over (order by MDATE) IS NULL)
THEN CASE
WHEN lag(MSYMBOL,1) over (order by MDATE) <> lag(MSYMBOL,2) over (order by MDATE)
OR (lag(MSYMBOL,1) over (order by MDATE) IS NULL AND lag(MSYMBOL,2) over (order by MDATE) IS NOT NULL)
OR (lag(MSYMBOL,1) over (order by MDATE) IS NOT NULL AND lag(MSYMBOL,2) over (order by MDATE) IS NULL)
THEN lag(MSYMBOL,2) over (order by MDATE)
ELSE lag(MSYMBOL,1) over (order by MDATE)
END
ELSE MSYMBOL
END as FLAG
from MYTABLE
但你最好将比较反转为使用 =。
select MYTABLE.*,
CASE
WHEN MSYMBOL = lag(MSYMBOL,1) over (order by MDATE)
THEN MSYMBOL
WHEN lag(MSYMBOL,1) over (order by MDATE) = lag(MSYMBOL,2) over (order by MDATE)
THEN lag(MSYMBOL,1) over (order by MDATE)
ELSE lag(MSYMBOL,2) over (order by MDATE)
END as FLAG
from MYTABLE
输出：
MDATE
MSYMBOL
FLAG
01-NOV-21
02-NOV-21
03-NOV-21
04-NOV-21
05-NOV-21
Square
06-NOV-21
Circle
07-NOV-21
Circle
Circle
08-NOV-21
Circle
Circle
09-NOV-21
Square
Circle
db<>fiddle here
我有一个带有嵌套 IF 条件的 excel 公式，它将当前行值与紧邻的前一行以及前一行与来自同一列的前第二行值进行比较。
公式：
=IF(B8<>B7,IF(B7<>B6,B6,B7),B8)
已尝试以下查询，但出现错误 "ORA-00920: 无效的关系运算符"
select MYTABLE.*,
CASE WHEN MSYMBOL over (order by MDATE) <> lag(MSYMBOL,1) over (order by MDATE)
THEN CASE
WHEN lag(MSYMBOL,1) over (order by MDATE) <> lag(MSYMBOL,2) over (order by MDATE)
THEN lag(MSYMBOL,2) over (order by MDATE)
ELSE lag(MSYMBOL,1) over (order by MDATE)
END,
ELSE MSYMBOL over (order by MDATE)
END as FLAG
from MYTABLE
Table 创建、插入语句和查询在此 link DB<>FIDDLE.
中更新感谢对此的任何帮助。提前致谢。
谢谢，
里查
MSYMBOL over (order by MDATE)无效，您只想使用MSYMBOL.- 第一个
END. 后多了一个逗号
- 此外，
NULL <> something永远不是真的，需要考虑到这一点。
您可以使用：
select MYTABLE.*,
CASE
WHEN MSYMBOL <> lag(MSYMBOL,1) over (order by MDATE)
OR (MSYMBOL IS NULL AND lag(MSYMBOL,1) over (order by MDATE) IS NOT NULL)
OR (MSYMBOL IS NOT NULL AND lag(MSYMBOL,1) over (order by MDATE) IS NULL)
THEN CASE
WHEN lag(MSYMBOL,1) over (order by MDATE) <> lag(MSYMBOL,2) over (order by MDATE)
OR (lag(MSYMBOL,1) over (order by MDATE) IS NULL AND lag(MSYMBOL,2) over (order by MDATE) IS NOT NULL)
OR (lag(MSYMBOL,1) over (order by MDATE) IS NOT NULL AND lag(MSYMBOL,2) over (order by MDATE) IS NULL)
THEN lag(MSYMBOL,2) over (order by MDATE)
ELSE lag(MSYMBOL,1) over (order by MDATE)
END
ELSE MSYMBOL
END as FLAG
from MYTABLE
但你最好将比较反转为使用 =。
select MYTABLE.*,
CASE
WHEN MSYMBOL = lag(MSYMBOL,1) over (order by MDATE)
THEN MSYMBOL
WHEN lag(MSYMBOL,1) over (order by MDATE) = lag(MSYMBOL,2) over (order by MDATE)
THEN lag(MSYMBOL,1) over (order by MDATE)
ELSE lag(MSYMBOL,2) over (order by MDATE)
END as FLAG
from MYTABLE
输出：
MDATE MSYMBOL FLAG 01-NOV-21 02-NOV-21 03-NOV-21 04-NOV-21 05-NOV-21 Square 06-NOV-21 Circle 07-NOV-21 Circle Circle 08-NOV-21 Circle Circle 09-NOV-21 Square Circle
db<>fiddle here