Sql server ave使用活接头代替或以前。但是，我应该避免所有的ORs和INs吗？我可以想到一个不相关的查询，其中我的条件在in子句中有6个项。我是否应该用5个联合体编写6个查询#3.抓得好。我感谢你的帮助#2.这应根据实际执行计划予以考虑。如果您没有大量的记录，或/I

---

ave使用活接头代替或以前。但是，我应该避免所有的ORs和INs吗？我可以想到一个不相关的查询，其中我的条件在in子句中有6个项。我是否应该用5个联合体编写6个查询#3.抓得好。我感谢你的帮助#2.这应根据实际执行计划予以考虑。如果您没有大量的记录，或/IN可能仍然会得到一个合理的时间。此外，对于复杂查询，您可以定义一个临时表并执行多个插入。除了可能的性能优化之外，它还允许更轻松的调试（每次插入后临时检查）。

name | paid_adjustment_amount | adj_date
Bob  | 1000                   | 4/7/2016
Mary | 2000                   | 4/8/2016
Bill | 5000                   | 4/8/2016
Mary | 4000                   | 4/10/2016
Bill | (1000)                 | 4/12/2016
Ann  | 3000                   | 4/30/2016

name | total_paid_amount
Bob  | 1000
Mary | 6000
Bill | 4000
Ann  | 3000

name | paid_to_date_amount
Bob  | 1000
Mary | 8000
Bill | 3000
Ann  | 3000
Joe  | 4000      

INSERT INTO contractor
SELECT to_date_payment.name, 
    to_date_payment.paid_to_date_amount - v_sum.total_paid_amount,
    GETDATE()
FROM to_date_payment
LEFT JOIN v_sum ON to_date_payment.name = v_sum.name
WHERE to_date_payment.paid_to_date_amount - v_sum.total_paid_amount <> 0
    OR v_sum.name IS NULL

SELECT to_date_payment.name, 
    to_date_payment.paid_to_date_amount - v_sum.total_paid_amount,
    GETDATE()
FROM to_date_payment
JOIN v_sum ON to_date_payment.name = v_sum.name
WHERE to_date_payment.paid_to_date_amount - v_sum.total_paid_amount <> 0

UNION ALL

SELECT to_date_payment.name, 
    to_date_payment.paid_to_date_amount,    -- or NULL if this is really intended
    GETDATE()
FROM to_date_payment
-- NOT EXISTS is usually faster than LEFT JOIN ... IS NULL
WHERE NOT EXISTS (SELECT 1 FROM v_sum V WHERE V.name = to_date_payment.name)