SQL CASE WHEN問題，查詢根本不運行

Question

我有一個用於零售業務的小型數據庫，在該數據庫中，我有一個名為“ Dispatched”的字段，該字段用於指示商品是否已經發貨。 當然，這是1和0，我嘗試了一種簡單的情況，當1顯示為Yes，0顯示為No。

我的完整查詢是：

SELECT 
orders.OrdersID, 
stock.ItemName, 
basket.Quantity, 
customer.FirstName, 
customer.LastName, 
address.AddressLine1, 
address.AddressLine2, 
address.TownOrCity, 
address.Postcode, 
address.Country, 
CASE WHEN basket.Dispatched = 1 THEN 'Yes' ELSE 'No' END AS basket.Dispatched 
FROM orders
JOIN OrdersBasketJoin ON orders.OrdersID = OrdersBasketJoin.OrdersID
LEFT JOIN basket ON OrdersBasketJoin.BasketID = basket.BasketID
JOIN customer ON orders.CustomerID = customer.CustomerID
JOIN address ON orders.DeliveryAddress = address.AddressID
JOIN stock ON basket.StockID = stock.StockID
ORDER BY  `customer`.`CustomerID` ASC
LIMIT 0 , 30

該查詢可以在沒有CASE WHEN的情況下正常運行，並且在正常選擇Dispatched時將顯示1和0，而在引用Dispatched時WHERE可以正常工作。

但是當我嘗試添加

CASE WHEN basket.Dispatched = 1 THEN 'Yes' ELSE 'No' END AS basket.Dispatched

我得到錯誤

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '.Dispatched FROM orders JOIN OrdersBasketJoin ON orders.OrdersID = Ord' at line 12

根據我的研究，這幾乎就像一個案例一樣簡單，並且我相信語法是正確的。

不知道它是否只是一個視覺錯誤，但是CASE中的“ END”不會像已知的功能那樣亮起，而JOIN，ON，LEFT等都亮起，無論END不在哪里。

任何和所有幫助都非常感激-湯姆

Answer 1

您在address.Country之后缺少,因此您遇到語法錯誤嘗試此操作

SELECT 
orders.OrdersID, 
stock.ItemName, 
basket.Quantity, 
customer.FirstName, 
customer.LastName, 
address.AddressLine1, 
address.AddressLine2, 
address.TownOrCity, 
address.Postcode, 
address.Country, 
(CASE WHEN basket.Dispatched = 1 THEN 'Yes' ELSE 'No' END) AS `basket.Dispatched` 
FROM orders
JOIN OrdersBasketJoin ON orders.OrdersID = OrdersBasketJoin.OrdersID
LEFT JOIN basket ON OrdersBasketJoin.BasketID = basket.BasketID
JOIN customer ON orders.CustomerID = customer.CustomerID
JOIN address ON orders.DeliveryAddress = address.AddressID
JOIN stock ON basket.StockID = stock.StockID
ORDER BY  `customer`.`CustomerID` ASC
LIMIT 0 , 30

Answer 2

放反引號：

AS `basket.Dispatched` 

Answer 3

CASE WHEN basket.Dispatched = 1 THEN 'Yes' ELSE 'No' END AS 'basket.Dispatched'

您在別名名稱前后缺少單引號。

我在沒有單引號的DEV機器上嘗試了此操作，並且遇到相同的錯誤。

Msg 102, Level 15, State 1, Line 1
Incorrect syntax near '.'.