2
A
回答
1
它絕對有可能的,但這個過程是漫長的,我使用loop
由sys.columns
檢索列名來檢查每個列的 數據exists
。請試試這個,如果它可以幫助你在任何條款:
這裏我檢查每一列的值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
在樣本數據列中沒有出現真正滿足這個條件,但在任何情況下,我認爲您需要動態SQL來根據此要求選擇哪些列將出現在結果集中。 –