加入以下SQL查詢的替代

在下面的查詢中，我們將根據「property_id」在「move_out_date」上添加天數。加入以下SQL查詢的替代

我們已經寫下面的查詢，它工作正常。

但問題是，如果有N個，我們需要使用加入了N次（在下面情況下，只有2個屬性）的屬性數量。

有沒有更好的和優化的方法來完成它？

SELECT 
    * 
FROM 
    leases l 
    JOIN lease_processes lp ON (lp.management_company_id = l.management_company_id AND lp.lease_id = l.id AND lp.customer_id IS NULL) 
    JOIN lease_customers lc ON (lc.management_company_id = l.management_company_id AND lc.lease_id = l.id AND lc.customer_id = l.primary_customer_id) 
WHERE 
    l.management_company_id = 2636 
    AND lp.fmo_processed_on IS NULL 
    AND lc.lease_status_type_id = 6 
    AND (lp.move_out_date + INTERVAL '5 day' <= date(NOW()) AND l.property_id = 28949) 

UNION 

SELECT 
    * 
FROM 
    leases l 
    JOIN lease_processes lp ON (lp.management_company_id = l.management_company_id AND lp.lease_id = l.id AND lp.customer_id IS NULL) 
    JOIN lease_customers lc ON (lc.management_company_id = l.management_company_id AND lc.lease_id = l.id AND lc.customer_id = l.primary_customer_id) 
WHERE 
    l.management_company_id = 2636 
    AND lp.fmo_processed_on IS NULL 
    AND lc.lease_status_type_id = 6 
    AND (lp.move_out_date + INTERVAL '1 day' <= date(NOW()) AND l.property_id = 28098)

來源

2013-11-21 Rakesh K

您可能想要考慮編輯您的標籤，以便我們可以真實地告訴您的環境是什麼。

除非我錯過了一些你沒有觸及連接條件，只是改變where子句。情況就是這樣，你可以使用像CASE這樣的適當的條件或更適當的方法，你可以將文字間隔值（'1 day'等）保存到相關屬性的租約表記錄的屬性中，然後過濾一次計算值。

SELECT 
    * 
FROM 
    leases l 
    JOIN lease_processes lp ON (lp.management_company_id = l.management_company_id AND lp.lease_id = l.id AND lp.customer_id IS NULL) 
    JOIN lease_customers lc ON (lc.management_company_id = l.management_company_id AND lc.lease_id = l.id AND lc.customer_id = l.primary_customer_id) 
WHERE 
    l.management_company_id = 2636 
    AND lp.fmo_processed_on IS NULL 
    AND lc.lease_status_type_id = 6 
    AND (lp.move_out_date + l.property_moveout_interval <= date(NOW()) 
AND l.property_id in var_some_aggregated_ID_list)

來源

2013-11-21 04:20:34 Carth

這是PostgreSQL的。我猜上述查詢不會工作，因爲property_moveout_interval對於所有屬性都不相同。 –

SELECT 
    * 
FROM 
    leases l 
    JOIN lease_processes lp ON (lp.management_company_id = l.management_company_id AND lp.lease_id = l.id AND lp.customer_id IS NULL) 
    JOIN lease_customers lc ON (lc.management_company_id = l.management_company_id AND lc.lease_id = l.id AND lc.customer_id = l.primary_customer_id) 
WHERE 
    l.management_company_id = 2636 
    AND lp.fmo_processed_on IS NULL 
    AND lc.lease_status_type_id = 6 
    AND ((lp.move_out_date + INTERVAL '5 day' <= date(NOW())) OR (lp.move_out_date + INTERVAL '1 day' <= date(NOW()))) 
    AND l.property_id = 28949

來源

2013-11-21 04:21:10 Santhosh

加入以下SQL查詢的替代

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