How to Get a count of NULL s in Every Column in a Table | MS SQL Server | TSQL

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@MSSQLDBATechSupport 20 күн бұрын
www.richardswinbank.net/tsql/count_nulls ============================================ DECLARE @schema NVARCHAR(128) = 'myschema' DECLARE @table NVARCHAR(128) = 'MyTable' DECLARE @sumCols NVARCHAR(MAX) = '' DECLARE @unpivotCols NVARCHAR(MAX) = '' DECLARE @sql NVARCHAR(MAX) = '' SELECT @sumCols += ' , SUM(CASE WHEN [' + COLUMN_NAME + '] IS NULL THEN 1 ELSE 0 END) AS [' + COLUMN_NAME + ']' , @unpivotCols += ' , [' + COLUMN_NAME + ']' FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = @schema AND TABLE_NAME = @table SET @sql = 'WITH cte AS ( SELECT ' + SUBSTRING(@sumCols, 6, LEN(@sumCols)) + ' , COUNT(*) AS [ROWS IN TABLE] FROM [' + @schema + '].[' + @table + '] ) SELECT '', ['' + ColumnName + '']'' AS ColumnName , NullCount FROM cte UNPIVOT ( NullCount FOR ColumnName IN ( ' + SUBSTRING(@unpivotCols, 6, LEN(@unpivotCols)) + ' , [ROWS IN TABLE] ) ) upvt ORDER BY CASE ColumnName WHEN ''ROWS IN TABLE'' THEN 1 ELSE 2 END , NullCount DESC' PRINT @sql EXEC(@sql)
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