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I've come across some SQL queries in Oracle that contain '(+)' and I have no idea what that means. Can someone explain its purpose or provide some examples of its use? Thanks
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'@' just signifies that it is a parameter. You can add the value for that parameter during execution process eg: sqlcommand cmd = new sqlcommand(query,connection); cmd.parameters.add("@custid","1"); sqldatareader dr = cmd.executequery();
%s is a placeholder used in functions like sprintf. Check the manual for other possible placeholders. $sql = sprintf($sql, "Test"); This would replace %s with the string "Test".
The LIKE operator is used in a WHERE clause to search for a specified pattern in a column. There are two wildcards often used in conjunction with the LIKE operator: The percent sign (%) represents zero, one, or multiple characters. The underscore sign (_) represents one, single character.
In SQL Server, symbol @@ is prefixed to global variables. The server maintains all the global variables.
It's Oracle's synonym for OUTER JOIN.
SELECT * FROM a, b WHERE b.id(+) = a.id gives same result as
SELECT * FROM a LEFT OUTER JOIN b ON b.id = a.id If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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