rspec/rules/S2243/abap/rule.adoc

== Why is this an issue?

``++SELECT++`` with ``++JOIN++`` always performs better than nested selects.


=== Noncompliant code example

[source,abap]
----
SELECT * FROM SPFL INTO SPFLI_WA.
  SELECT * FROM SFLOGHT INTO SFLIGHT_WA
    WHERE CARRID = SPFLI_WA-CARRID
    AND CONNID = SPFLIGHT_WA_CONNID.
  ENDSELECT.
ENDSELECT.
----


=== Compliant solution

[source,abap]
----
SELECT * INTO WA
  FROM SPFLI AS P INNER JOIN SFLIGHT AS F
    ON P~CARRID = F~CARRID AND
        P~CONNID = F~CONNID.
END-SELECT.
----

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== Implementation Specification
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include::message.adoc[]

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