#!/usr/bin/env tclsh

set testdir [file dirname $argv0]
source $testdir/tester.tcl

do_execsql_test coalesce {
    select coalesce(NULL, 1);
} {1}

do_execsql_test coalesce-2 {
    select coalesce(NULL, NULL, 1);
} {1}

do_execsql_test coalesce-nested {
    select coalesce(NULL, coalesce(NULL, NULL));
} {}

do_execsql_test coalesce-nested-2 {
    select coalesce(NULL, coalesce(NULL, 2));
    select coalesce(NULL, coalesce(1, 2));
    select coalesce(0, coalesce(1, 2));
} {2
1
0}

do_execsql_test coalesce-null {
    select coalesce(NULL, NULL, NULL);
} {}

do_execsql_test coalesce-first {
    select coalesce(1, 2, 3);
} {1}

do_execsql_test coalesce-from-table {
    select coalesce(NULL, 1) from users limit 1;
} {1}

do_execsql_test coalesce-from-table-column {
    select coalesce(NULL, age) from users where age = 94 limit 1;
} {94}

do_execsql_test coalesce-from-table-multiple-columns {
    select coalesce(NULL, age), coalesce(NULL, id) from users where age = 94 limit 1;
} {94|1}