如何在mysql语句中创建多个计数

我很难在mysql语句中计数超过2个

我的

计数（b.entry\u id）为totalbooking

不起作用。我做错了什么？语句设置是否正确​​?

我就是这样尝试的：

"SELECT 
    t.restaurant_id as restaurant_id, ct.title as title, 
    count(DISTINCT t.cardid) as totalmembers, 
    count(t.restaurant_id) as totaltransactions, 
    count(b.entry_id) as totalbooking
    from transactions as t   
    inner join exp_menucard_booking as b on (t.restaurant_id = b.entry_id)
    inner join exp_channel_titles as ct on (t.restaurant_id = ct.entry_id)
    inner JOIN exp_channel_data as cd on (ct.entry_id = cd.entry_id)
    where t.cardid != 88888888 and ct.status = 'open'
    group by t.restaurant_id
    order by ct.title asc";

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使用此模式计算整个行集的子集：

sum( case when ColumnToBeTested = trueCondition then 1 else 0 end) as SubCount

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你说的“不工作”是什么意思？算上（b.entry\u id），因为totalbooking不算。其他一切都很好。