trying to understand the code...

[tran008]

Hi all,

I'm trying to understand the code below, with (+). Comming from MS-SQL server, I never seem this before. Can some explain what the (+) does?

thanks

SELECT
tblA.FIRST_NAME,
tblA.lAST_NAME,
tblA.STREET_NUMBER,
btlA.CITY
FROM
tblA,
tblB
WHERE
LAST_NAME LIKE 'TRAN%'
and
tbla.CODE = tblB.CODE

SELECT
tblA.FIRST_NAME,
tblA.lAST_NAME,
tblA.STREET_NUMBER,
btlA.CITY
FROM
tblA,
tblB
WHERE
LAST_NAME LIKE 'TRAN%'
and
tbla.CODE = tblB.CODE(+)

 

[SamBones]

The first one only returns rows in tblA where there is a match on CODE in tblB as per the WHERE clause.

The second one is doing a left outer join and will return all rows in tblA, even if there is no matching CODE in tblB. Since you aren't selecting any columns from tblB, the second one is equivalent to this...

SELECT
[indent]tblA.FIRST_NAME,
tblA.lAST_NAME,
tblA.STREET_NUMBER,
tblA.CITY
[/indent]FROM
[indent]tblA
[/indent]WHERE[indent]LAST_NAME LIKE 'TRAN%';[/indent]

 

[tran008]

Thank you very much...