2
A
回答
1
它绝对有可能的,但这个过程是漫长的,我使用loop
由sys.columns
检索列名来检查每个列的 数据exists
。请试试这个,如果它可以帮助你在任何条款:
这里我检查每一列的值1只
CREATE TABLE testing(val1 INT, val2 INT, val3 INT)
INSERT INTO testing VALUES
(1, 0, 1),(1, 0, 1),(1, 1, 1)
Table: testing
val1 val2 val3
1 0 1
1 0 1
1 1 1
DECLARE @sql NVARCHAR(500), @list VARCHAR(500)
DECLARE @num INT=1, @col_name VARCHAR(100) = NULL, @cnt INT
WHILE(@num<=3)
BEGIN
SELECT @col_name = name FROM sys.columns
WHERE object_id = OBJECT_ID('testing') and column_id = @num
SET @cnt = 0
SET @sql = '
IF NOT EXISTS(SELECT 1 FROM testing WHERE ' + @col_name + ' = 0) SET @cnt = 1'
EXEC sp_executesql @sql, N'@cnt INT OUT', @cnt OUT
IF @cnt = 1
SET @list = COALESCE(@list + ',', '') + @col_name
SET @num = @num+1
END
SET @sql = '
SELECT ' + @list + ' FROM testing'
EXEC(@sql)
OUTPUT:
val1 val3
1 1
1 1
1 1
在样本数据列中没有出现真正满足这个条件,但在任何情况下,我认为您需要动态SQL来根据此要求选择哪些列将出现在结果集中。 –