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2013-04-02T21:29:55.717
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As I noted originally, while you can't use a user-defined function, you can't solve this problem. It is quite simply not doable. If you can use a function, then try this for size: <pre><code>CREATE FUNCTION find_first_number(str VARCHAR(32), def INTEGER DEFAULT 0) RETURNING INTEGER AS number WITH(NOT VARIANT); DEFINE i INTEGER; DEFINE j INTEGER; DEFINE l INTEGER; DEFINE c CHAR(1); DEFINE nstr VARCHAR(32); IF str IS NULL THEN RETURN def; END IF; LET l = LENGTH(str); FOR i = 0 TO l LET c = SUBSTR(str, i, 1); IF c >= "0" AND c <= "9" THEN LET nstr = c; FOR j = i + 1 TO l LET c = SUBSTR(str, j, 1); IF c >= "0" AND c <= "9" THEN LET nstr = nstr || c; ELSE RETURN nstr; -- String of digits in middle of string END IF; END FOR; RETURN nstr; -- String of digits at end of string END IF; END FOR; RETURN def; END FUNCTION; </code></pre> The <code>WITH(NOT VARIANT)</code> clause tells the optimizer that for the same input, the function always produces the same output (so the output is invariant for a given input). Test code: <pre><code>CREATE TEMP TABLE ffn_test ( str VARCHAR(32), def INTEGER, num INTEGER ); INSERT INTO ffn_test VALUES("UNKNOWN", 0, 0); INSERT INTO ffn_test VALUES("ROOKIE", -1, -1); INSERT INTO ffn_test VALUES("LEVEL 1", 0, 1); INSERT INTO ffn_test VALUES("LEVEL 2A", 0, 2); INSERT INTO ffn_test VALUES("LEVEL 2B", 0, 2); INSERT INTO ffn_test VALUES("LEVEL 20", 0, 20); INSERT INTO ffn_test VALUES("LEVEL 999", 0, 999); INSERT INTO ffn_test VALUES("LEVEL 3.0", 0, 3); INSERT INTO ffn_test VALUES(NULL, 0, 0); SELECT str, def, num, find_first_number(str, def) AS result, CASE WHEN num = find_first_number(str, def) THEN "PASS" ELSE "FAIL" END pass_fail FROM ffn_test; </code></pre> Test output: <pre><code>UNKNOWN 0 0 0 PASS ROOKIE -1 -1 -1 PASS LEVEL 1 0 1 1 PASS LEVEL 2A 0 2 2 PASS LEVEL 2B 0 2 2 PASS LEVEL 20 0 20 20 PASS LEVEL 999 0 999 999 PASS LEVEL 3.0 0 3 3 PASS 0 0 0 PASS </code></pre>
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PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. PONumber lookup and sorting in Informix
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 PTQuestion
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1. PTAnswer
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1. This table or related slice is empty.
UserOwnerUserId
1. USJonathan Leffler
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PostsAcceptedAnswerId
1. PONumber lookup and sorting in Informix
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1. This table or related slice is empty.
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1. VO
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CommentsPostId
1. COThank you, that worked nicely.
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 USSayak Banerjee

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