Difference between revisions of "Technical Notes"

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*Query to find unmatched <b>trap_id</b>'s:
 
*Query to find unmatched <b>trap_id</b>'s:
  SELECT
+
  SELECT trap_routes.trap_id, trap.trap_id
  trap_routes.trap_id, trap.trap_id
+
  FROM trap_routes
  FROM  
+
LEFT JOIN trap ON trap_routes.trap_id = trap.trap_id
  trap_routes LEFT JOIN trap ON trap_routes.trap_id = trap.trap_id
+
  WHERE trap.trap_ID IS NULL  
  WHERE  
+
  trap.trap_ID IS NULL
+
  
 
* Query to update <b>trap</b> table using values from <b>trap_routes</b> table:
 
* Query to update <b>trap</b> table using values from <b>trap_routes</b> table:

Revision as of 12:47, 16 January 2008

  • Query to find unmatched trap_id's:
SELECT trap_routes.trap_id, trap.trap_id
FROM trap_routes
LEFT JOIN trap ON trap_routes.trap_id = trap.trap_id
WHERE trap.trap_ID IS NULL 
  • Query to update trap table using values from trap_routes table:
UPDATE 
  trap, trap_routes 
SET 
  trap.trap_route = trap_routes.trap_route,
  trap.trap_route_sequence = trap_routes.trap_route_sequence 
WHERE 
  trap_routes.trap_id = trap.trap_id