Not possible in SQL. "b.answer || a.epxr" is a string. It does not get evaluated. Unless you write your own eval() function that executes its parameter as an SQL statement, which is going to be very slow as each result row needs to prepare, step and finalize its very own statement.
-----Ursprüngliche Nachricht----- Von: Keshav Tadimeti [mailto:ktadim...@aol.com] Gesendet: Mittwoch, 02. Juli 2014 20:18 An: sqlite-users@sqlite.org Betreff: [sqlite] evaluate expression stored in a column Hello all I have the following requirement: Table a -------- id int expr text result integer Insert into a values (10,' > 2'); Table b ------- id int answer text Insert into b values (10,'10'); I need to evaluate the condition that 10 > 2 and store the result of that expression in a.result. I am failing to have the expression evaluated. select b.answer || a.expr from a inner join b on a.id = b.id; -- gives 10 > 2 I need to see 1 (since 10 > 2). Kindly help!! Best -- Using Opera's mail client: http://www.opera.com/mail/ _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users ----------------------------------------------------------------------- Gunter Hick Software Engineer Scientific Games International GmbH Klitschgasse 2 – 4, A - 1130 Vienna, Austria FN 157284 a, HG Wien Tel: +43 1 80100 0 E-Mail: h...@scigames.at This e-mail is confidential and may well also be legally privileged. If you have received it in error, you are on notice as to its status and accordingly please notify us immediately by reply e-mail and then delete this message from your system. Please do not copy it or use it for any purposes, or disclose its contents to any person as to do so could be a breach of confidence. Thank you for your cooperation. _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
