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WHERE field NOT IN...?

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WHERE field NOT IN...? Database Management forum discussing non-database specific SQL. Structured Query Language was designed to be a robust and standardized language for manipulating relational databases.

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  #1  
Old September 11th, 2003, 10:54 AM
*mt *mt is offline
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Unhappy WHERE field NOT IN...?
Hi All,

Am writing a query for the following tables.

MODULES
pkey*
name
type_key
source

CMODULES
pkey*
company_key
module_key
...

IS there a way of returning fields from the MODULES table where MODULES.pkey IS NOT IN CMODULES (CMODULES.module_key) when CMODULES.company_key = an external variable.

Any Ideas?

Thanks for your help,
*mt
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  #2  
Old September 11th, 2003, 11:25 AM
swampBoogie swampBoogie is offline
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Yes

Code:
select * from modules 
where pkey not in (
select module_key from cmodules
where company_key = <value>)


how you handle the external value depends on which environment you are working in.
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  #3  
Old September 11th, 2003, 11:55 AM
*mt *mt is offline
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Ah, that would work except small probs. Am using mySQL and can't do sub-queries

*mt
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  #4  
Old September 11th, 2003, 12:08 PM
hedge hedge is offline
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Does it support MINUS, you could outer join it and MINUS with the inner join
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Old September 11th, 2003, 01:11 PM
swampBoogie swampBoogie is offline
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Mysql does not support Minus.

Code:
select m.* from modules m 
left outer join cmodules c on 
m.pkey = c.module_key 
and company_key = <value> 
where c.module_key is null
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  #6  
Old September 11th, 2003, 03:54 PM
*mt *mt is offline
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Fantastic, i'll be sure to try that out tomorrow at work. Thanks for your help.
*mt
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