Proper use of Inner Join

When multiple SAP tables are logically joined, it is always advisable to use inner join to read the data from them. This certainly reduces the load on the network. 

Let us take an example of 2 tables, zairln and zflight. The table zairln has the field airln, which is the airline code and the field lnnam, which is the name of the airline. The table zflight has the field airln, the airline code and other fields which hold the details of the flights that an airline operates.

Since these 2 tables a re logically joined by the airln field, it is advisable to use the inner join.

             Select a~airln a~lnnam b~fligh b~cntry into table int_airdet

            From zairln as a inner join zflight as b on a~airln = b~airln.

 In order to restrict the data as per the selection criteria, a where clause can be added to the above inner join.

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This tutorial contains a number of pages, each one explaining a tip or trick. You can either browse them one by one (click on the NEXT button, or jump straight to a tip or trick which interests you:

• Introduction

• Selection criteria

• Aggregate functions

• Views instead of base tables

• The "into table" clause

• Modifying a group of lines

• Use of binary search option

• Appending two internal tables

• Table buffering

• Use of "for all" entries

• Proper structure of "where" clause

• Proper use of "move" statement

• Proper use of "inner join"

• Use of "ABAP Sort" instead of "Order By"

• Tools for analysis of performance