Are there any grammar rules available for evaluating the logical/conditional expressions? I want to parse between, Like, exists, IN expressions using ANTLR.
logical/conditional expressions parsing in ANTLR
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Well, there are existing grammars for Antlr3 (and 4 as well) for most common languages, including ISO SQL and some specific flavours (like PL/SQL, mySQL): http://www.antlr3.org/grammar/list.html
I admit I didn't check myself, but I'd expect them to be able to parse mentioned logical operations.
I did write my own Antlr (4) grammar for an arcane SQL flavour, it's fairly simple. I unfortunately don't have access to it anymore, but I might be able to help if you get stuck.