SQl Server -> CREATE TABLE IF NOT EXISTS (ตรวจสอบ table ว่ามีอยู่ก่อนการสร้างใหม่)

IF NOT EXISTS (SELECT * FROM sysobjects WHERE name='customer' AND xtype='U')
	CREATE TABLE [dbo].[customer](
		[CustomerID] [varchar](4) NOT NULL,
		[Name] [varchar](50) NULL,
		[Email] [varchar](50) NULL,
		[CountryCode] [varchar](2) NULL,
		[Budget] [float] NULL,
		[Used] [float] NULL
	)
GO