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help with recordset query

Thread began 4/01/2010 2:58 pm by mr hankey | Last modified 4/05/2010 5:16 pm by mr hankey | 711 views | 4 replies |

mr hankey

help with recordset query

hi,

i am trying to create an advanced clients results page, i created it using data assist and going to keep the view buttons etc, however i need to join the tables.

i basically want to join all the tables together and they all have a key that relates to each other.

problem is when i try this just with a few tables i get no records even though there are clients and clients that have policies in protection table.

the query so far is this:

Select
*
From
buytolet Inner Join
clients On buytolet.clients_ClientID = clients.ClientID Inner Join
generalinsurance On generalinsurance.clients_ClientID = clients.ClientID
Inner Join
mortgage On mortgage.clients_ClientID = clients.ClientID Inner Join
users On clients.ClientUserID = users.UserID Inner Join
protection On protection.clients_ClientID = clients.ClientID

it returns no records, can anyone help?

many thanks

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Jason ByrnesWebAssist

where no rows are being returned, it suggests that one of the join comparisons is not being met.

Put another way:
when using INNER JOIN a result is only returned if there is a match in both tabels being compared. for example:
one of you comparisons is:
generalinsurance.clients_ClientID = clients.ClientID

If there are no records in the generalinsurance.clients_ClientID column that match a record in the clients.ClientID column, a result will not be returned.

Where you have 5 different comparisons to the clients.ClientID column, all of those comparisons MUST make a match to be able to return a result.

To troubleshoot, you should start taking away joins till you find the one that is causing the mismatched data.

You also may need to rewrite your query using a different join type, like a left join, right join or outer join.

See the following page for details on join types:
Join_%28SQL%29

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mr hankey

hey jason i appreciate you taking time to help me.

i think i now see what was wrong. i am trying to return the clients even if there is no match in the other joined tables so maybe a left join would be best?

many thanks jason

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Jason ByrnesWebAssist

yeah, sounds like a left join should help.

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mr hankey

jason,

thanks again. i have ran a quick test with left join and looks like that is the one.

thanks for your help with that.

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