Question

我尝试使用以下动态SQL迭代表中的列，并获取表中每个字段的百分比弹出窗口。这是脚本：

CREATE TABLE [dbo].[PercentPop] (
[Field Name] VARCHAR(255),
[Percent Pop] DECIMAL(6, 3)
)

DECLARE @rowCount as INT
SET @rowCount = (SELECT MAX([Ordinal_Position]) FROM information_schema.columns)

DECLARE @i as INT
SET @i = 1

DECLARE @Column as varchar(255)
DECLARE @Percent as DECIMAL(6, 3)

WHILE @i <= @rowCount
BEGIN
   SET @Column = (SELECT [Column_name] FROM information_schema.columns 
   WHERE [table_name] = 'myTable' AND [Ordinal_Position] = @i)

   SET @Percent = (SELECT 100.0 * SUM(CASE WHEN @Column <> '' THEN 1 ELSE 0 END) / COUNT(*) 
   AS ColumnPercent FROM myTable)

   INSERT INTO [dbo].[PercentPop] VALUES (@Column, @Percent)

  SET @i = @i + 1
END

此脚本的结果会正确生成字段名称，但每个百分比都是100％。我想知道某些事情是否正确迭代，因为第一个字段是100％填充的，但我知道后续字段不是。

动态SQL - 遍历表列并获取填充字段的百分比

0 个答案: