COALESCE使用帶括號的錯誤

select 
tele_plan.id as value, 
tele_plan.plan_name as label, 
tele_plan.plan_cost as c, 
tele_plan.plan_details as d, 
COALESCE (tele_plan.plan_cost - sum(tele_payment_items.amount) as balance ,0) from `tele_plan_select` 
    inner join `tele_plan` on `tele_plan`.`id` = `tele_plan_select`.`teleplan_id` 
    left join `tele_payment_defs` on `tele_payment_defs`.`telereg_id` = `tele_plan_select`.`telereg_id` 
    left join `tele_payment_items` on `tele_payment_items`.`telepaymentdefs_id` = `tele_payment_defs`.`id` 
    and 
    `tele_payment_items`.`teleplan_id` = `tele_plan`.`id` 
    where `tele_plan_select`.`telereg_id` = 9 
    group by `tele_plan`.`id`

我在這裏使用laravel框架。我想這裏的問題是COALESCE。我試圖通過減去兩列值來找到餘額。如果沒有任何回報作爲balance它應該設置爲0，這是我正在嘗試做的。COALESCE使用帶括號的錯誤

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2016-12-07 Usama Rehan

歡迎來到堆棧溢出！您可以先參加[tour]（http://stackoverflow.com/tour）並學習[如何提出一個好問題]（http://stackoverflow.com/help/how-to-ask）並給我們* *錯誤信息**請。我們會更容易幫助你。 –

那COALESCE用法是錯誤的。改變它像

COALESCE (tele_plan.plan_cost, 0) - COALESCE(SUM(tele_payment_items.amount), 0) as balance

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2016-12-07 10:52:55 Rahul

是的，它的工作。謝謝。 –

COALESCE使用帶括號的錯誤

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