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Pengantar SQL Server

John MacKintosh

Instructor

Variabel

SELECT * 
FROM artist 
WHERE name = 'AC/DC';

Sekarang ubah kueri untuk artis lain:

SELECT * 
FROM artist 
WHERE name = 'U2';

Untuk menghindari pengulangan, buat variabel:

SELECT * 
FROM artist 
WHERE name = @my_artist;

DECLARE

DECLARE @

Variabel integer:

DECLARE @test_int INT

Variabel varchar:

DECLARE @my_artist VARCHAR(100)

SET

Variabel integer:

DECLARE @test_int INT

SET @test_int = 5

Tetapkan nilai ke @my_artist:

DECLARE @my_artist  varchar(100)

SET @my_artist = 'AC/DC'

DECLARE @my_artist varchar(100)
DECLARE @my_album varchar(300);

SET @my_artist = 'AC/DC'
SET @my_album  = 'Let There Be Rock' ;

SELECT --
FROM --
WHERE artist = @my_artist
AND album = @my_album;

DECLARE @my_artist varchar(100)
DECLARE @my_album varchar(300);

SET @my_artist = 'U2'
SET @my_album  = 'Pop' ;

SELECT --
FROM --
WHERE artist = @my_artist
AND album = @my_album;

Tabel sementara

SELECT 
  col1, 
  col2, 
  col3 INTO #my_temp_table
FROM my_existing_table 
WHERE 
  -- Conditions

#my_temp_table ada sampai koneksi atau sesi berakhir

-- Hapus tabel secara manual
DROP TABLE #my_temp_table

Mari mendeklarasikan variabel!

Pengantar SQL Server