[英]SQL Query on displaying a result by eliminating on a condition
I am trying to write a SQL query for this sample input and output:我正在尝试为此示例输入和输出编写 SQL 查询: with the following condition: The hierarchy will be the same as below具有以下条件:层次结构将与以下相同
Can someone help me on this?有人可以帮我吗?
I could try only the following code for 1st condition, but this is removing all the records and giving incorrect result:对于第一个条件,我只能尝试以下代码,但这会删除所有记录并给出不正确的结果:
select *,
from table t1
where code='PK' and length('filter')=0
SELECT T1.KEY,
T1.CODE,
CASE
WHEN CODE = 'PK' AND COALESCE(FILTER,0) = 0 THEN 'XXXX'
ELSE T1.FILTER
END AS FILTER
FROM TABLE T1
WHERE CODE != 'PK' OR (CODE='PK' AND COALESCE(FILTER,0) = 0)
In your query length('filter')
returns 6
在您的查询中length('filter')
返回6
select key, code, IF(code = 'PK', 'XXXX', filter) as filter
from table_t1
where (
code != 'PK'
OR
code = 'PK' AND (filter IS NULL OR filter = '')
)
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