1
連接表時,我有,我想加入沒有與.NET
SELECT b.nickname,count(a.doctor_id)
FROM a_table a
join b_table b
on (a.doctor_id=b.id_user)
GROUP BY a.doctor_id
和
SELECT doctor_id, SUM(medicine) medicine, SUM(radiology) radiology,sum(lab) lab, sum(act) act
FROM (
SELECT MAX(doctor_id) doctor_id,
SUM(IF(pm='F', cost, NULL)) medicine,
SUM(IF(pm='R', cost, NULL)) radiology,
SUM(IF(pm='L', cost, NULL)) lab,
SUM(IF(pm='P', cost, NULL)) act
FROM c_table
GROUP BY Trans_No
) t
GROUP BY doctor_id
我已經嘗試過加入
SELECT b.nickname, count(a.doctor_id), SUM(medicine) medicine, SUM(radiology) radiology,sum(lab) lab, sum(act) act
FROM (
SELECT MAX(doctor_id) doctor_id,
SUM(IF(pm='F', cost, NULL)) medicine,
SUM(IF(pm='R', cost, NULL)) radiology,
SUM(IF(pm='L', cost, NULL)) lab,
SUM(IF(pm='P', cost, NULL)) act
FROM c_table
GROUP BY Trans_No
) t
join a_table a on (a.doctor_id=t.doctor_id)
join b_table b on (a.doctor_id=b.id_user)
GROUP BY a.doctor_id
所有的這兩個查詢響應表有大量的數據(超過200萬的數據),我已經設置了我的CommandTimeout = 600,但它仍然沒有迴應
我加入了它錯誤還是隻是爲了許多數據?我該怎麼做才能得到結果?
直接在數據庫而不是代碼上運行查詢需要多長時間?它返回什麼? – David
您是否看過預計的執行計劃以查看可能發生的情況?這些表格是否適當地編制索引?索引統計數據是最新的嗎? – HABO