What is the diffrence between select single * and Select
upto 1 row?
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Answer Posted / chittidi
select single f1 f2 f3 ... into <wa> from <dbtab> where
<condition>. this where condition is important to fetch
exact record from database . for thsi purpose we provide
entire primary key combination in whrere conditon.
by using this statement to read exact information .
select f1 f2 f3 .... into <wa> from <dbtab> up to 1 rows
where <condition>
endselect.
it reads the first record found which may not be exact .
the where condition can be part of primary key combination.
it is mainly used to validate the INPUT.
IF WE ARE NOT PASSING ENTIRE COMBINATION OF PRIMARY KEY
IN SELET * SINGLE IT SIMPLY ACTS AS SELECT * UP TO 1 ROWS.
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