MS SQL Server Interview Question:

How To Write a Query with an Inner Join in MS SQL Server?

Submitted by: Administrator

If you want to query from two tables with an inner join, you can use the INNER JOIN ... ON clause in the FROM clause. The tutorial exercise below creates another testing table and returns output with an inner join from two tables: ggl_links and ggl.rates. The join condition is that the id in the ggl_links table equals to the id in the ggl_rates table:

CREATE TABLE ggl_rates (id INTEGER,
comment VARCHAR(16))
GO

INSERT INTO ggl_rates VALUES (101, 'The best')
GO
INSERT INTO ggl_rates VALUES (102, 'Well done')
GO
INSERT INTO ggl_rates VALUES (103, 'Thumbs up')
GO
INSERT INTO ggl_rates VALUES (204, 'Number 1')
GO
INSERT INTO ggl_rates VALUES (205, 'Not bad')
GO
INSERT INTO ggl_rates VALUES (206, 'Good job')
GO
INSERT INTO ggl_rates VALUES (207, 'Nice tool')
GO

SELECT ggl_links.id, ggl_links.url,
ggl_rates.comment FROM ggl_links
INNER JOIN ggl_rates ON ggl_links.id = ggl_rates.id
GO
id url comment
101 www.globalguideline.com The best
102 www.globalguideline.com/html Well done
103 www.globalguideline.com/sql Thumbs up

Note that when multiple tables are used in a query, column names need to be prefixed with table names in case the same colu
Submitted by: Administrator