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Join related table and count rows or sum sql server 2005 count rows: SELECT * FROM Table1 LEFT JOIN     (SELECT Level1ID, COUNT(Level2ID) AS Total FROM Table2 GROUP BY Level1ID) AS... Remove file not in list ADD ... THEN ... UNTIL ... data: begin of SERIES, N1 type I value 10, N2 type I value 20, N3 type I value 30, N4 type I value 40, ...
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Detect column exist
Sql server: 
-- Add new column if column not exists
IF NOT EXISTS(SELECT * FROM sys.columns WHERE Name = N'ColumnName' AND Object_ID = Object_ID(N'TableName'))
ALTER TABLE [TableName] ADD [ColumnName] VARCHAR(200)


-- Modify column name if new column not exists
IF NOT EXISTS(SELECT * FROM sys.columns WHERE Name = N'NewColumnName' AND Object_ID = Object_ID(N'TableName'))
EXECUTE sp_rename N'TableName.OldColumnName', N'NewColumnName', 'COLUMN'