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thinkphp 5 union 聯合查詢

$a = Db::name(表名)->field(欄位)->where(條件)->buildSql();
$b = Db::name(表名)->field(欄位)->where(條件)->buildSql();
$c = Db::name(表名)->field(欄位)->where(條件)->union([$a, $b])->buildSql();
$list = Db::table($c . ' a')->order(排序)->paginate(每頁個數);// $c . a是零時表名