Thanks for reply, pvaldes.

I noticed I misunderstood how to escape single quotes in sql. I thought of the case like this

insert into foo (bar,boo) values('''a', 'b');
[download]

And this is nothing surprise.

select '--foo';
[download]

I changed test data with real SQL with your advice. SQLite and Postgres accept these commands.

drop table foo;
create table foo(   --tabel foo
    bar text,       --fld name
    boo text        --again
);
--populate
insert into foo (bar,boo) values('''a', 'b'); -- insert quote's sake
insert into foo (bar,boo) values('c', 'd');   -- another line
select 'test' || 'abc' as a ;                 -- maybe you use dual wi
+th oracle?
select 'test''s' || 'abc' as a ;              -- maybe you use dual wi
+th oracle?
select '--foo';
[download]

So far, so good.

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