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Top Forums Shell Programming and Scripting Request: How to Parse dynamic SQL query to pad extra columns to match the fixed number of columns Post 302930910 by vikas_trl on Thursday 8th of January 2015 01:52:54 PM
Old 01-08-2015
Request: How to Parse dynamic SQL query to pad extra columns to match the fixed number of columns

Hello All,

I have a requirement in which i will be given a sql query as input in a file with dynamic number of columns. For example some times i will get 5 columns, some times 8 columns etc up to 20 columns.
So my requirement is to generate a output query which will have 20 columns all the times irrespective of number of input columns.

Sample input file
Code:
SELECT
A AS COL1,
COALESCE(B ,'123') AS COL2,
CAST(C AS TIMESTAMP(0)) AS COL3
FROM TABLE
WHERE X = Y AND Z > (SELECT A FROM TABLE2);

Expected output
Code:
SELECT
A AS COL1,
COALESCE(B ,'123') AS COL2,
CAST(C AS TIMESTAMP(0)) AS COL3
,NULL AS COL4
,NULL AS COL5
..
..
,NULL AS COL20
FROM TABLE
WHERE X = Y AND Z > (SELECT A FROM TABLE2);


Can someone one please help me achieve this in UNIX KSH/BASH?

Thanks in Advance
 

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SELECT 
INTO(7) SQL Commands SELECT INTO(7) NAME
SELECT INTO - create a new table from the results of a query SYNOPSIS
SELECT [ ALL | DISTINCT [ ON ( expression [, ...] ) ] ] * | expression [ AS output_name ] [, ...] INTO [ TEMPORARY | TEMP ] [ TABLE ] new_table [ FROM from_item [, ...] ] [ WHERE condition ] [ GROUP BY expression [, ...] ] [ HAVING condition [, ...] ] [ { UNION | INTERSECT | EXCEPT } [ ALL ] select ] [ ORDER BY expression [ ASC | DESC | USING operator ] [, ...] ] [ LIMIT { count | ALL } ] [ OFFSET start ] [ FOR UPDATE [ OF tablename [, ...] ] ] INPUTS TEMPORARY TEMP If specified, the table is created as a temporary table. Refer to CREATE TABLE [create_table(7)] for details. new_table The name (optionally schema-qualified) of the table to be created. All other inputs are described in detail for SELECT [select(7)]. OUTPUTS Refer to CREATE TABLE [create_table(7)] and SELECT [select(7)] for a summary of possible output messages. DESCRIPTION
SELECT INTO creates a new table and fills it with data computed by a query. The data is not returned to the client, as it is with a normal SELECT. The new table's columns have the names and data types associated with the output columns of the SELECT. Note: CREATE TABLE AS [create_table_as(7)] is functionally equivalent to SELECT INTO. CREATE TABLE AS is the recommended syntax, since SELECT INTO is not standard. In fact, this form of SELECT INTO is not available in PL/pgSQL or ecpg(1), because they interpret the INTO clause differently. COMPATIBILITY
SQL92 uses SELECT ... INTO to represent selecting values into scalar variables of a host program, rather than creating a new table. This indeed is the usage found in PL/pgSQL and ecpg(1). The PostgreSQL usage of SELECT INTO to represent table creation is historical. It's best to use CREATE TABLE AS for this purpose in new code. (CREATE TABLE AS isn't standard either, but it's less likely to cause confu- sion.) SQL - Language Statements 2002-11-22 SELECT INTO(7)
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