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> need help on selecting distinct values

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#1 (permalink)

Old

11-11-09, 06:24

lifzgud

lifzgud is offline

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Join Date: Sep 2009

Posts: 6

need help on selecting distinct values

Hi,
I have two tables a and b

Table a

x y
1 a
2 b

Table b

y z
a alpha
a bravo

When i do select a.x from a,b where a.y=b.y it will return me
1
1

I need only distinct values without using the distinct command.
How is this possible?

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#2 (permalink)

Old

11-11-09, 06:34

sathyaram_s sathyaram_s is offline

sathyaram_s is offline

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Join Date: Aug 2001

Location: UK

Posts: 4,534

Why don't you want to use distinct ????
What version, platform, fixpak of db2 are you on ?

Looks like an assignment question ..

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#3 (permalink)

Old

11-11-09, 08:02

DB2Plus

DB2Plus is offline

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Join Date: Jul 2009

Posts: 150

Lightbulb

using GROUP BY

Quote:

Originally Posted by lifzgud

View Post

Hi,
I have two tables a and b

Table a

x y
1 a
2 b

Table b

y z
a alpha
a bravo

When i do select a.x from a,b where a.y=b.y it will return me
1
1

I need only distinct values without using the distinct command.
How is this possible?

Code:

select a.x from a,b where a.y=b.y
GROUP BY  a.x

Kara

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#4 (permalink)

Old

11-11-09, 09:33

Stealth_DBA Stealth_DBA is offline

Stealth_DBA is offline

Registered User

Join Date: May 2009

Posts: 472

lifzgud, Here is another way:

Code:

SELECT X
FROM A
WHERE EXISTS(SELECT *
             FROM B
             WHERE A.Y = B.Y
            )

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#5 (permalink)

Old

11-11-09, 09:55

Lenny77

Lenny77 is offline

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Join Date: Jul 2009

Location: NY

Posts: 886

Question

Looks good

Code:

select a.x 
from a 
where a.y in (select y from b)

Also looks good...

Lenny

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