Difference between revisions of "String over columns"

Revision as of 10:16, 30 July 2012

Search for a string across columns

schema:scott

DROP TABLE bedroom

 CREATE TABLE bedroom(
  name VARCHAR(20)),
  floorcolor VARCHAR (20),
  ceilingcolor VRACHAR(20),
  wallcolor VARCHAR(20));
INSERT INTO bedroom VALUES ('Jim','RED','GREEN','YELLOW');
INSERT INTO bedroom VALUES ('Bob','YELLOW','BLUE','BLACK');
INSERT INTO bedroom VALUES ('Allan','BLUE','PINK','BLACK');
INSERT INTO bedroom VALUES ('George','BLUE','GREEN','OAK');

SELECT name FROM bedroom
WHERE floorcolor = 'YELLOW'
OR ceilingcolor = 'YELLOW'
OR wallcolor = 'YELLOW'

Using OR increases the chances for careless mistakes instead CONCAT could be used to make the query more efficient. To avoid problems make sure to add in separators and if a value cna be null make sure to use it is wrapped in COALESCE OR NVL for example: COALESCE(floorcolor,).

SELECT name FROM scott.bedroom
WHERE CONCAT (':',floorcolor,':',ceilingcolor,':',wallcolor,':')
LIKE '%:YELLOW:%'

@@ Line 24: / Line 24: @@
 COALESCE(floorcolor,'').
 </div>
-<source lang='sql' class='def'>SELECT name FROM bedroom
+<source lang='sql' class='def'>SELECT name FROM scott.bedroom
 WHERE CONCAT (':',floorcolor,':',ceilingcolor,':',wallcolor,':')
 LIKE '%:YELLOW:%'</source>

Difference between revisions of "String over columns"

Revision as of 10:16, 30 July 2012

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