From SQL:

expr1 between expr2 and expr3

There is also this which I think is still in the latest ANSI standard:

substring(expr1 from expr2 for expr3)

There's a bunch of other odd syntaxes along these lines.

And aggregates and window functions, not sure how you'd classify them:

aggregate_fn(exrp1 order by expr2,expr3, ...) filter where expra1

window_fn(expr1,expr2, ... partition by expra1, expra2, ... order by exprb1, exprb2, ...)

(And window functions have frame clauses too.)

Would you count this as a ternary operator:

expr1 join expr2 on expr3

Also, I think Agda has user definable ternary operators.