SQL Server Notes

mssql.sql

-- Find duplicate SKUs in a table
SELECT [SKU], COUNT([SKU]) AS NumOccurences
  FROM [DB].[dbo].[TABLE]
  Group by [SKU]
  HAVING ( Count([SKU]) > 1)

-- Find duplicate SKUs in a table, return with other columns
SELECT *
FROM [DB].[dbo].[TABLE]
WHERE [SKU] IN
( SELECT [SKU]
  FROM [DB].[dbo].[TABLE]
  Group by [SKU]
  HAVING ( Count([SKU]) > 1) );
  
-- Delete entries
DELETE FROM [DB].[dbo].[TABLE]
WHERE [SKU] IN ('SKU1','SKU2','SKU2');

-- Update multiple entries
-- ## Create backup - CTAS
SELECT * 
INTO [DB].[dbo].[NEW_TABLE]
FROM [DB].[dbo].[OLD_TABLE]
-- ## Update statement
UPDATE TABLE
SET UPDATE_COLUMN = T.UPDATE_COLUMN
FROM [DB].[dbo].[TABLE]
JOIN (
    VALUES
        ('REF_VALUE1', 'UPDATE_VALUE1'),
        ('REF_VALUE2', 'UPDATE_VALUE2')
) T (REF_COLUMN, UPDATE_COLUMN) ON T.REF_COLUMN = TABLE.REF_COLUMN
  
-- Turn on Ad Hoc Queries/OPENROWSET
EXEC sp_configure 'show advanced options', 1
RECONFIGURE
GO
EXEC sp_configure 'ad hoc distributed queries', 1
RECONFIGURE
GO

-- Last X in Y Days methods
CAST(ISNULL(ROUND(SUM(CASE WHEN [DATE] > (CURRENT_TIMESTAMP - 30) 
	THEN [SALES_QUANTITY]-[RETURN_QUANTITY] END),2),0) AS int) 
	AS 'SALES_LAST30'