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Calculated Values in a WHERE clause

I am having a problem with using calculated values in a WHERE clause.
My query is below. DB2 gives me this error message: Error: SQL0206N
"APPRAISAL_LESS_PRICE" is not valid in the context where it is used.
SQLSTATE=42703

SELECT DISTINCT S3.OPR_APPLICATION_NR,
S3.APPLICATION_ID,
S3.APPRAISAL_TYPE_CD,
S3.Appraisal_Used_Amount,
S3.RPT_LEVEL2_NR,
S3.PROP_CLTRL_PRCHS_LAST_6_MO_IN,
S3.Price,
S3.Appraisal_Value,
(S3.Appraisal_Used_Amount - S3.Price) AS
value_Used_Less_Price,
(S3.Appraisal_Value - S3.Price) AS Appraisal_Less_Price,
(S3.Appraisal_Value - S3.Appraisal_Used_Amount) AS
APPRAISAL_VAL_MINUS_VAL_USED
FROM LM_PURCHASE_STEP3 AS S3
WHERE (Appraisal_Less_Price >= 0) AND (VALUE_USED_LESS_PRICE <= 0)
OR (Appraisal_Less_Price <= 0) AND (APPRAISAL_VAL_MINUS_VAL_USED)
>= 0

What am I doing wrong?

Jan 3 '07 #1
2 10461
Ji*********@wellsfargo.com wrote:
I am having a problem with using calculated values in a WHERE clause.
My query is below. DB2 gives me this error message: Error: SQL0206N
"APPRAISAL_LESS_PRICE" is not valid in the context where it is used.
SQLSTATE=42703

SELECT DISTINCT S3.OPR_APPLICATION_NR,
S3.APPLICATION_ID,
S3.APPRAISAL_TYPE_CD,
S3.Appraisal_Used_Amount,
S3.RPT_LEVEL2_NR,
S3.PROP_CLTRL_PRCHS_LAST_6_MO_IN,
S3.Price,
S3.Appraisal_Value,
(S3.Appraisal_Used_Amount - S3.Price) AS
value_Used_Less_Price,
(S3.Appraisal_Value - S3.Price) AS Appraisal_Less_Price,
(S3.Appraisal_Value - S3.Appraisal_Used_Amount) AS
APPRAISAL_VAL_MINUS_VAL_USED
FROM LM_PURCHASE_STEP3 AS S3
WHERE (Appraisal_Less_Price >= 0) AND (VALUE_USED_LESS_PRICE <= 0)
OR (Appraisal_Less_Price <= 0) AND (APPRAISAL_VAL_MINUS_VAL_USED)
>>= 0


What am I doing wrong?
Have a look here:
http://publib.boulder.ibm.com/infoce...n/r0000875.htm

As you can see, the WHERE clause is evaluated _before_ the select list.
Therefore, you cannot use values calculated in the select list in the where
clause.

This also makes sense especially if you consider functions with side effects
(i.e. external action) being applied in the SELECT list. You only want to
call such functions for qualifying only and not for all rows.

An alternative may be to use common table expressions or subselects:

SELECT ...
FROM ( SELECT col1, col2 + col3 AS value
FROM ... ) AS t
WHERE value BETWEEN ... AND ...

--
Knut Stolze
DB2 z/OS Utilities Development
IBM Germany
Jan 3 '07 #2
>What am I doing wrong? <<

Not reading a good book on SQL :) Here is how a SELECT works in SQL
.... at least in theory. Real products will optimize things, but the
code has to produce the same results.

a) Start in the FROM clause and build a working table from all of the
joins, unions, intersections, and whatever other table constructors are
there. The <table expressionAS <correlation nameoption allows you
give a name to this working table which you then have to use for the
rest of the containing query.

b) Go to the WHERE clause and remove rows that do not pass criteria;
that is, that do not test to TRUE (i.e. reject UNKNOWN and FALSE). The
WHERE clause is applied to the working set in the FROM clause.

c) Go to the optional GROUP BY clause, partiton the original table
into groups and reduce each grouping to a *single* row, replacing the
original working table with the new grouped table. The rows of a
grouped table must be only group characteristics: (1) a grouping column
(2) a statistic about the group (i.e. aggregate functions) (3) a
function or constant(4) an expression made up of only those three
items. The original table no longer exists and you cannot reference
anything in it (this was an error in early Sybase products).

d) Go to the optional HAVING clause and apply it against the grouped
working table; if there was no GROUP BY clause, treat the entire table
as one group.

e) Go to the SELECT clause and construct the expressions in the list.
This means that the scalar subqueries, function calls and expressions
in the SELECT are done after all the other clauses are done. The AS
operator can also give names to expressions in the SELECT list. These
new names come into existence all at once, but after the WHERE clause,
GROUP BY clause and HAVING clause have been executed; you cannot use
them in the SELECT list or the WHERE clause for that reason.

If there is a SELECT DISTINCT, then redundant duplicate rows are
removed. For purposes of defining a duplicate row, NULLs are treated
as matching (just like in the GROUP BY).

f) Nested query expressions follow the usual scoping rules you would
expect from a block structured language like C, Pascal, Algol, etc.
Namely, the innermost queries can reference columns and tables in the
queries in which they are contained.

g) The ORDER BY clause is part of a cursor, not a query. The result
set is passed to the cursor, which can only see the names in the SELECT
clause list, and the sorting is done there. The ORDER BY clause cannot
have expression in it, or references to other columns because the
result set has been converted into a sequential file structure and that
is what is being sorted.

As you can see, things happen "all at once" in SQL, not "from left to
right" as they would in a sequential file/procedural language model. In
those languages, these two statements produce different results:
READ (a, b, c) FROM File_X;
READ (c, a, b) FROM File_X;

while these two statements return the same data:

SELECT a, b, c FROM Table_X;
SELECT c, a, b FROM Table_X;

Think about what a confused mess this statement is in the SQL model.

SELECT f(c2) AS c1, f(c1) AS c2 FROM Foobar;

That is why such nonsense is illegal syntax.

Jan 4 '07 #3

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