Give the syntax of Inner,outer Join?"
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Answer Posted / shreeshail diggi
Effect
The join syntax represents a recursively nestable join
expression. A join expression consists of a left-hand and a
right- hand side, which are joined either by means of
[INNER] JOIN or LEFT [OUTER] JOIN. Depending on the type of
join, a join expression can be either an inner (INNER) or
an outer (LEFT OUTER) join. Every join expression can be
enclosed in round brackets. If a join expression is used,
the SELECT command circumvents SAP buffering.
The syntax of the join conditions join_cond is the same as
that of the sql_cond conditions after the addition WHERE,
with the following differences:
At least one comparison must be specified after ON.
Individual comparisons may be joined using AND only.
All comparisons must contain a column in the database table
or the view dbtab_right on the right-hand side as an
operand.
The following additions not be used: NOT, LIKE, IN.
No sub-queries may be used.
For outer joins, only equality comparisons (=, EQ) are
possible.
If an outer join occurs after FROM, the join condition of
every join expression must contain at least one comparison
between columns on the left-hand and the right-hand side.
In outer joins, all comparisons that contain columns as
operands in the database table or the view dbtab_right on
the right-hand side must be specified in the corresponding
join condition. In the WHERE condition of the same SELECT
command, these columns are not allowed as operands
Example INNER JOIN :
Join the columns carrname, connid, fldate of the database
tables scarr, spfli and sflight by means of two inner
joins. A list is created of the flights from p_cityfr to
p_cityto. Alternative names are used for every table.
PARAMETERS: p_cityfr TYPE spfli-cityfrom,
p_cityto TYPE spfli-cityto.
DATA: BEGIN OF wa,
fldate TYPE sflight-fldate,
carrname TYPE scarr-carrname,
connid TYPE spfli-connid,
END OF wa.
DATA itab LIKE SORTED TABLE OF wa
WITH UNIQUE KEY fldate carrname connid.
SELECT c~carrname p~connid f~fldate
INTO CORRESPONDING FIELDS OF TABLE itab
FROM ( ( scarr AS c
INNER JOIN spfli AS p ON p~carrid = c~carrid
AND p~cityfrom = p_cityfr
AND p~cityto = p_cityto )
INNER JOIN sflight AS f ON f~carrid = p~carrid
AND f~connid = p~connid ).
LOOP AT itab INTO wa.
WRITE: / wa-fldate, wa-carrname, wa-connid.
ENDLOOP.
Example OUTER JOIN:
PARAMETERS p_cityfr TYPE spfli-cityfrom.
DATA: BEGIN OF wa,
carrid TYPE scarr-carrid,
carrname TYPE scarr-carrname,
connid TYPE spfli-connid,
END OF wa,
itab LIKE SORTED TABLE OF wa
WITH NON-UNIQUE KEY carrid.
SELECT s~carrid s~carrname p~connid
INTO CORRESPONDING FIELDS OF TABLE itab
FROM scarr AS s
LEFT OUTER JOIN spfli AS p ON s~carrid = p~carrid
AND p~cityfrom =
p_cityfr.
LOOP AT itab INTO wa.
IF wa-connid = '0000'.
WRITE: / wa-carrid, wa-carrname.
ENDIF.
ENDLOOP.
Thank's and Regards,
Shreeshail Diggi
SAP Technical Consultant Infinite India
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