PL/SQL :: Variables In SELECT Statement

Feb 19, 2013

I was given a SQL query to develop another query that will need to do something similar. The query I was given I believe is a stored procedure. It is PL/SQL and has a SELECT statement that looks like

SELECT :var1 AS var1
FROM t1
WHERE
:var1 = 1

In the past I have seen where variables can be used in the WHERE clause like

SELECT c1
FROM t1
WHERE
c1 = :my_column_valueand this makes sense to me.

Usually :my_column_value is declared in the DECLARE block of the PL/SQL. In the query I was given, :my_column_value is not declared in any DECLARE blocks (maybe I wasn't given the entire code??). But even if it was, that would be even more confusing because in the DECLARE block it could be assigned one value and then set to another value in the WHERE clause???

The first query doesn't make sense to me and when I run it as plain SQL I get an error like "SP2-0552: Bind variable "var1" not declared. I am guessing that such a syntax is not valid for regular SQL?

The only thing I can gather that the first query does is something along the lines of

SELECT 1 as var1

so it will output a 1 for every row. Not always that interesting of a query, but it is needed sometimes, I know. But I still don't understand this type of assignment.

So what's going on here? I'd be happy to look it up and read about it myself, but I don't know what to search for.

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Below the syntax:

DECLARE
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-----
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