计数查询中“AS”中的语法错误

Question

我在计数查询中使用了select(DB::raw('count(*) as count'))。我认为select(DB::raw('count(*) as count'))中可能有错误。这是Syntax错误。

我的代码：

$data = DB::table('finaltrade')
->select(DB::raw('count(*) as count'))
->join('exchanges', 'finaltrade.exchange_id', '=', 'exchanges.id')
->where('finaltrade.user_id', $user_id)
->whereTime(DB::raw('IF(finaltrade.buy_datetime<finaltrade.sell_datetime, finaltrade.buy_datetime, finaltrade.sell_datetime) '), '>=', DB::raw('exchanges.start_time'))
->whereTime(DB::raw('IF(finaltrade.buy_datetime<finaltrade.sell_datetime, finaltrade.buy_datetime, finaltrade.sell_datetime) '), '<=', DB::raw("ADDTIME(exchanges.start_time, '1:00:00')"));

​

。

Answer 1

尝试添加get()或first()

$data = DB::table('finaltrade')
->select(DB::raw('count(*) as count'))
->join('exchanges', 'finaltrade.exchange_id', '=', 'exchanges.id')
->where('finaltrade.user_id', $user_id)
->whereTime(DB::raw('IF(finaltrade.buy_datetime<finaltrade.sell_datetime, finaltrade.buy_datetime, finaltrade.sell_datetime) '), '>=', DB::raw('exchanges.start_time'))
->whereTime(DB::raw('IF(finaltrade.buy_datetime<finaltrade.sell_datetime, finaltrade.buy_datetime, finaltrade.sell_datetime) '), '<=', DB::raw("ADDTIME(exchanges.start_time, '1:00:00')"))
->get();

或

$data = DB::table('finaltrade')
->select(DB::raw('count(*) as count'))
->join('exchanges', 'finaltrade.exchange_id', '=', 'exchanges.id')
->where('finaltrade.user_id', $user_id)
->whereTime(DB::raw('IF(finaltrade.buy_datetime<finaltrade.sell_datetime, finaltrade.buy_datetime, finaltrade.sell_datetime) '), '>=', DB::raw('exchanges.start_time'))
->whereTime(DB::raw('IF(finaltrade.buy_datetime<finaltrade.sell_datetime, finaltrade.buy_datetime, finaltrade.sell_datetime) '), '<=', DB::raw("ADDTIME(exchanges.start_time, '1:00:00')"))
->first();