I am not sure what exactly is going on here. When an expression starts with a string and I try to append the results of a mathematical operation to it, sometimes it works, sometimes, it doesn't, and I can't find the pattern behind what works and what doesn't.
1. Simple mathematical expression by itself works SQLite> select cast(-1.5 as integer)*-1 1 2. Adding a string in front of a simple cast by itself works SQLite> select '- '||cast(-1.5 as integer) - -1 3. When there is a mathematical expression after the string, I get a 0. My string is nowhere to be seen in the output SQLite> select '- '||cast(-1.5 as integer)*-1 0 4. But when I add 1 instead of multiplying, it produces output that seems to evaluate everything before the addition to zero SQLite> select '- '||cast(-1.5 as integer)+1 1 5. Enclosing the mathematical expression in a printf produces the correct output SQLite> select '- '|| printf(cast(-1.5 as integer)*-1) - 1 6. If the output starts with a number, then it doesn't seem to matter what follows. Notice that the last part of the expression below is the same as the expression in query number 3 above, but it works fine now whereas previously it produced a zero as the output SQLite> select cast(1.5 as integer)||'-'||(cast(-1.5 as integer)*-1) 1-1 I am sure it has something to do with order of operations and the affinity of the operands, but can someone give me a summary that I can understand readily? The only mentions of the "||" operator on the SQLite website ( https://sqlite.org/lang_expr.html) don't really explain what is going on in the above examples. Any help would be much appreciated. Thank you. Balaji Ramanathan _______________________________________________ sqlite-users mailing list sqlite-users@mailinglists.sqlite.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users
