和條件在WHERE上多列

Question

我有兩個表

Table 1 = restaurants (r_id , type , cuisine_bkup) 
Table 2 = address (id , r_id , location, address) 

我申請這個查詢

SELECT * 
FROM restaurants r 
RIGHT JOIN addresses a ON a.r_id = r.r_id 
WHERE r.type LIKE 'Cafe' AND a.location LIKE 'Gulberg' AND r.cuisine_bkup LIKE 'Pizza' 
GROUP BY r.r_id 

它給我任何結果我應該怎麼做，我想做到這一點的條款，條件

Answer 1

使用%與like

WHERE r.type LIKE '%Cafe%' 
AND a.location LIKE '%Gulberg%' 
AND r.cuisine_bkup LIKE '%Pizza%' 

Answer 2

您可能需要通配符%來像這樣搜索列中的值：

SELECT * 
FROM restaurants r 
RIGHT JOIN addresses a ON a.r_id = r.r_id 
WHERE r.type LIKE '%Cafe%' AND a.location LIKE '%Gulberg%' AND r.cuisine_bkup LIKE '%Pizza%' 
GROUP BY r.r_id 

否則其他選項（我猜是使用和代替OR）

SELECT * 
FROM restaurants r 
RIGHT JOIN addresses a ON a.r_id = r.r_id 
WHERE r.type LIKE '%Cafe%' OR a.location LIKE '%Gulberg%' OR r.cuisine_bkup LIKE '%Pizza%' 
GROUP BY r.r_id 

（另外需要注意的是，你會得到的結果爲您並且當且僅當所有三個條件都爲真時，即，r.type LIKE 'Cafe' AND a.location LIKE 'Gulberg' AND r.cuisine_bkup LIKE 'Pizza'）

Answer 3

SELECT * 
FROM restaurants r 
RIGHT JOIN addresses a ON a.r_id = r.r_id AND a.location LIKE 'Gulberg' 
WHERE r.type LIKE 'Cafe' AND r.cuisine_bkup LIKE 'Pizza' 
GROUP BY r.r_id 

做出正確加入工作，你必須移動到AND a.location LIKE 'Gulberg'ON section.Otherwise它將作爲INNER JOIN工作。

我想指出的是，「=」會比LIKE快得多（如果你是等同字符）..

希望這有助於