Joins

[#1]

Hi Guys,

I have two Tables:

1:QPGT

//[QPGT]:   // Code group texts
   [MANDT] as [Client_MANDT],    

   [KATALOGART] as CatalogType,

   [CODEGRUPPE] as [Code group_FEGRP],

   [CODE] as CODE,

   [SPRACHE] as [Language_SPRACHE],

   [KURZTEXT] as [Short text_KURZTEXT],

   [GELOESCHT] as [Deleted record_GELOESCHT],

   [INAKTIV] as [Record inactive_INAKTIV],

   [LTEXTV] as [Long Text_LTEXTV]; 

2:VIQMFE

// Generated Table for View VIQMFE

Load

   [MANDT] as [Client_MANDT],

   [QMNUM] as [Notification_QMNUM],

   [FEGRP] as [Code group_FEGRP],

   [FECOD] as CODE,

   [FEKAT] as CatalogType,

   FETXT AS Text_FETXT,

   [OTKAT] as [Catalog type_OTKATq],

   [OTGRP] as [Code group_OTGRPq],

   [OTEIL] as [ObjectPartCode_OTEILq]; 

Which Join must I use and Why ? If I need a comprehensive set of this data in one table.

[#2]

Hi,

you need to explain what data you need from both the tables & also decide which key field/fields make ur data unique.

1) i see multiple fields with same names in the two tables. do you really want to join on all these fields ?

2) if you want all the records from 1st table & only the matching ones from 2nd table--use left join

   if you want all the records from 2nd table & only the matching ones from 1st table--use right join

   if you want exactly the matching records from the two tables --use inner join

it depends

[jagan]

Hi,

What is the Transaction table in this?  Use Left Join to the Transaction table, if you need only the matching records then use inner join.

Regards,

Jagan.

[#4]

In essence the table you declare first will be the primary based on a join. So by using the following:

1. Inner Join - matches all IDs in both tables

2. Left Join - retrieves all data from the primary table (left side) even if the secondary table (right side) doesn't have the matching IDs

3. Right Join - retrieves all data from the secondary table (right side) even if the primary table (left side) doesn't have the matching IDs

[#5]

Hi,

Thanks for ur reply.

You mean to say:

If I want only matching records(IDs are same in both tables) and  their relevant data,I must use Inner Join?

Regards,
Rochelle

[#6]

No problem.

Yes, that's correct. Joins are very similar to SQL Server, DB2, etc. However, QlikView creates a single table based on joins whereas SQL Server for example does a table mapping and creates relationships.

[#7]

Ok ..

Thanks Guys..