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Access 2007 SQL Query
Posted on 2013-02-04
Hi,
I've got a little query on a query.
I have 1 big table, there is 1 field which is [text](key field) the rest are [yes/no]
Acc Number [text]
Electrician [yes/no]
plumber [yes/no]
Joinery [yes/no]
.... lots and lots more
Basically I have this table of trades and I want the query to make their trades into Strings.
So if Acc number "1" is ticked for electrician and joinery, the query results will display, "electrician joinery" etc etc
Currently I'm doing this with 100's of IIF statements, Electrician2:iff([electric
This works but takes ages and I'm sure there is a ...more intelligent efficient way to do what I'm trying to achieve :)
Any help appreciated.
Rich
I've got a little query on a query.
I have 1 big table, there is 1 field which is [text](key field) the rest are [yes/no]
Acc Number [text]
Electrician [yes/no]
plumber [yes/no]
Joinery [yes/no]
.... lots and lots more
Basically I have this table of trades and I want the query to make their trades into Strings.
So if Acc number "1" is ticked for electrician and joinery, the query results will display, "electrician joinery" etc etc
Currently I'm doing this with 100's of IIF statements, Electrician2:iff([electric
This works but takes ages and I'm sure there is a ...more intelligent efficient way to do what I'm trying to achieve :)
Any help appreciated.
Rich
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6 Comments
Active today
The best way to do this if those trades are mutually exclusive is to have a single field whose options (drop-down list) are the trades you mention.
If that is not feasible another option (again assuming these are mutually exclusive options) without nested IIFs is to assign a value to each of those trades and do something like this:
Profession: ABS(1 * [Electrician] + 2 * Plumber + 3 * Joinery ... etc)
Create a lookup table for those values and associated descriptions
1 Electrician
2 Plumber
3 Joinery
You could lookup the text based on the value on an as-needed basis...
If that is not feasible another option (again assuming these are mutually exclusive options) without nested IIFs is to assign a value to each of those trades and do something like this:
Profession: ABS(1 * [Electrician] + 2 * Plumber + 3 * Joinery ... etc)
Create a lookup table for those values and associated descriptions
1 Electrician
2 Plumber
3 Joinery
You could lookup the text based on the value on an as-needed basis...
Around 80-100 mark...
I understand I've structured this incorrectly. However this was partly due to use convience...
Thanks
I understand I've structured this incorrectly. However this was partly due to use convience...
Thanks
Active today
I don't think there is any neat, concise way to do this.
Another way to handle this would be a huge UNION query:
SELECT x, y, z, "Electrician" AS Trade FROM YourTable WHERE Electrician = true
UNION
SELECT x, y, z, "Plumber" AS Trade FROM YourTable WHERE Plumber= true
UNION
SELECT x, y, z, "Joinery" AS Trade FROM YourTable WHERE Joinery = true
Etc...
Anyway you do this you are going to have to address each of the 80=100 trades in some way.
Another way to handle this would be a huge UNION query:
SELECT x, y, z, "Electrician" AS Trade FROM YourTable WHERE Electrician = true
UNION
SELECT x, y, z, "Plumber" AS Trade FROM YourTable WHERE Plumber= true
UNION
SELECT x, y, z, "Joinery" AS Trade FROM YourTable WHERE Joinery = true
Etc...
Anyway you do this you are going to have to address each of the 80=100 trades in some way.
cool, thought as much, but was wondering if there may have been some sql looping sequence which may have worked.
Active today
-->> sql looping sequence
Not in Access SQL. In a SQL Stored Procedure, perhaps.
Access also has the Switch function:
Switch(Electrician = True, "Electrician", Plumber= True, "Plumber", Joinery = True, "Joinery" ...)
Again a really ugly SQL statement, but a step up from nested IIFs.
You could probably create your own custom VBA function to do this as well....
But I don't know if this would help performance any.
Not in Access SQL. In a SQL Stored Procedure, perhaps.
Access also has the Switch function:
Switch(Electrician = True, "Electrician", Plumber= True, "Plumber", Joinery = True, "Joinery" ...)
Again a really ugly SQL statement, but a step up from nested IIFs.
You could probably create your own custom VBA function to do this as well....
But I don't know if this would help performance any.
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