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Query help please

 
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revdpoel

New User


Joined: 01 Nov 2006
Posts: 56

PostPosted: Thu Sep 02, 2010 7:45 pm    Post subject: Query help please
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I got two tables.

table 1 consists of three fields:
automaat-key (primary key)
automaat-status (0= active, 1 = inactive, 2 = blocked)
pin (filled with 0 or 1)
chip (filled with 0 or 1)

Table 2 consists of two fields:
day-key (primary-key)
automaat-key (primary-key)
tx-aantal

For each automaat-status i got to have (separately) the sum of pin and the sum of chip. A row in table 1 is only taken in consideration when there is a row in table 2 for that specific automaat-key where tx-aantal > 0

Since there are three possible statuses, I will get three rows as a result.

Thanks
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GuyC

Senior Member


Joined: 11 Aug 2009
Posts: 1278
Location: Belgium

PostPosted: Thu Sep 02, 2010 9:55 pm    Post subject:
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Code:
select sum()
group by
where exists

are very basic SQL-elements
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