Avoiding failing entire procedure if one SELECT statement fails

• DataAnalyst011

  SSCarpal Tunnel

  Points: 4035

  More actions

  June 27, 2013 at 1:47 pm

  #275609

  I have a few procedures with multiple SELECT statements (using UNION ALL) in a single procedure. Is there a way to avoid failure for the entire procedure if one of the SELECT statements fail?

  Below is a sample scenario. I know somethings could be done to kick out the offending data. However, the table illustrates what I'm facing. Is there a way to have SQL avoid t1 and t2 (since they can't CAST the VARCHAR) but still process t3 and 4? Thanks for any help!

  CREATE TABLE tbl

  (

  col1 varchar(25) not null,

  col2 varchar(25) not null

  )

  INSERT INTO tbl (col1, col2)

  VALUES

  ('t1', '3.21'),

  ('t1', '2.29'),

  ('t1', ''),

  ('t2', '21'),

  ('t2', ''),

  ('t2', '19'),

  ('t2', '20a'),

  ('t3', '3.11'),

  ('t3', '3.54'),

  ('t4', '18'),

  ('t4', '29'),

  ('t4', '26')

  ;

  /*Print the results of table creation*/

  SELECT tbl.col1, tbl.col2

  FROM tbl

  ;

  /*Create procedure AvgCol which attempts to CAST the values in Col2 for t1, t2, t3, and t4*/

  CREATE PROCEDURE AvgCol AS

  SELECT tbl.col1, CAST(tbl.col2 AS Decimal(8,2)) AS col2_cast

  FROM tbl

  WHERE tbl.col1 = 't1'

  UNION ALL

  SELECT tbl.col1, CAST(tbl.col2 AS Decimal(8,2)) AS col2_cast

  FROM tbl

  WHERE tbl.col1 = 't2'

  UNION ALL

  SELECT tbl.col1, CAST(tbl.col2 AS Decimal(8,2)) AS col2_cast

  FROM tbl

  WHERE tbl.col1 = 't3'

  UNION ALL

  SELECT tbl.col1, CAST(tbl.col2 AS Decimal(8,2)) AS col2_cast

  FROM tbl

  WHERE tbl.col1 = 't4'

  ;

  /*Executes AvgCol. It fails because two of the SELECT statements are trying to cast a varchar('', '20a') to numeric*/

  EXEC AvgCol

• mister.magoo

  SSC-Forever

  Points: 47174

  More actions

  June 27, 2013 at 1:52 pm

  #1628119

  Ideally you would have suitable exclusions in your where clause to avoid procesing errors.

  You cannot trap errors on one select in a UNION, but you could insert the results of each SELECT into a table and have TRY..CATCH round each one, then select from the table at the end...

  MM
  

  ---

  
  select geometry::STGeomFromWKB(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