踩坑 ： 用mycat尽量不要使用以下语句统计

SELECT
    count(pay_way = 'ZFB_sm' OR NULL) AS zfbsmcount,
    count(pay_way = 'ZFB_h5' OR NULL) AS zfbh5count,
    count(pay_way = 'WX_sm' OR NULL) AS wxsmcount,
    count(pay_way = 'WX_h5' OR NULL) AS wxh5count,
    count(pay_way = 'JHY_zfb' OR NULL) AS jhyzfbcount,
    count(pay_way = 'JHY_wy' OR NULL) AS jhywycount,
    count(pay_way = 'HX_wy' OR NULL) AS hxwycount,
    count(pay_way = 'JHYGG_zfb' OR NULL) AS jhyggcount,
    count(pay_way = 'HX_kj_pc' OR NULL) AS hxkjpccount,
    count(pay_way = 'HX_kj_sj' OR NULL) AS hxkjsjcount,
    count(pay_way = 'JA_kj_pc' OR NULL) AS jakjpccount,
    count(pay_way = 'JA_kj_sj' OR NULL) AS jakjsjcount,
    count(pay_way = 'JA_wy' OR NULL) AS jawycount,
    count(pay_way = 'JPsm_yl' OR NULL) AS jpsmylcount,
    count(pay_way = 'Jpfyt_zfbh5'OR NULL) AS jpfyth5count,
    count(pay_way = 'hyzfb_wy' OR NULL) AS hyzfbwycount,
    count(pay_way = 'hyzfb_kj_pc'OR NULL) AS hyzfbkjpccount,
    count(pay_way = 'hyzfb_kj_sj'OR NULL) AS hyzfbkjsjcount,
    count(pay_way = 'Hongxing_zfbh5'OR NULL) AS hongxingzfbh5count,
    count(pay_way = 'Tongda_zfbsm'OR NULL) AS tongdazfbsmcount,
    count(pay_way = 'Tongda_zfbh5'OR NULL) AS tongdazfbh5count,
    count(pay_way = 'Zfj_zfbh5' OR NULL) AS zfjzfbh5count
FROM
    orders
WHERE
    state = '2'
AND order_time LIKE '2018/08/09%'

试着换为 类似这种 SUM(CASE pay_way WHEN 'Jpfyt_zfbh5' THEN 1 ELSE 0 END )  Jpfyt_zfbh5,