The CASE expressions compare an expression to a set of simple expressions to determine the result and CASE can be used in any statement that allows a valid expression.
It is IF-THEN-ELSE statement.
It is IF-THEN-ELSE statement.
Syntax: For a simple CASE expression
CASE COLL
WHEN 1 THEN 'One'
WHEN 2 THEN 'Two'
WHEN 3 THEN 'Three'
ELSE 'None'
END AS COLL_Name
-- CREATE TABLE CREATE TABLE [dbo].[Tbl_Demo]( [ID] [int] IDENTITY(1,1) NOT NULL, [Name] [varchar](500) NULL, [Age] [int] NULL, [IsActive] [bit] NULL, [IsDeleted] [bit] NULL, CONSTRAINT [PK_Tbl_Demo] PRIMARY KEY CLUSTERED ( [ID] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] ) ON [PRIMARY] GO SET ANSI_PADDING OFF GO --INSERT TABLE ROWS SET IDENTITY_INSERT [dbo].[Tbl_Demo] ON GO INSERT [dbo].[Tbl_Demo] ([ID], [Name], [Age], [IsActive], [IsDeleted]) VALUES (1, N'Anil Singh', 30, 1, 0) GO INSERT [dbo].[Tbl_Demo] ([ID], [Name], [Age], [IsActive], [IsDeleted]) VALUES (2, N'Aradhya', 3, 1, 0) GO INSERT [dbo].[Tbl_Demo] ([ID], [Name], [Age], [IsActive], [IsDeleted]) VALUES (3, N'Reena', 28, 1, 0) GO INSERT [dbo].[Tbl_Demo] ([ID], [Name], [Age], [IsActive], [IsDeleted]) VALUES (4, N'Sunil Singh', 27, 1, 0) GO INSERT [dbo].[Tbl_Demo] ([ID], [Name], [Age], [IsActive], [IsDeleted]) VALUES (5, N'Sushil', 22, 1, 0) GO SET IDENTITY_INSERT [dbo].[Tbl_Demo] OFF GO
--SELECT WITH CASE AND THE RESULT LOOKS LIKE SELECT Name, CASE Name WHEN 'Aradhya' THEN 'Aradhya Singh' WHEN 'Reena' THEN 'Reena Singh' WHEN 'Sushil' THEN 'Aradhya Singh' ELSE Name END AS Full_Name FROM [dbo].[Tbl_Demo] --THE RESULT LOOKS LIKE Name Full_Name --------------------------- Anil Singh Anil Singh Aradhya Aradhya Singh Reena Reena Singh Sunil Singh Sunil Singh Sushil Aradhya Singh
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Anil Singh is an author, tech blogger, and software programmer. Book writing, tech blogging is something do extra and Anil love doing it. For more detail, kindly refer to this link..
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