如何在許多表格中搜索？

Question

我願做一個搜索在許多表與

<input type="text" name="search" /> 

$sql = mysql_query("SELECT * FROM cars,people,cities WHERE 
cars.reg= '$search' || people.phone = '$search' || city.address = '$search'"); 

是否有可能做到這一點？有關使用PHP進行數據庫搜索的任何建議？

非常感謝

Answer 1

你可以使用UNION ALL查詢

SELECT name as findValue, 
'cars' as tableName 
FROM cars 
where cars.name = "$search" 
UNION ALL 
SELECT name as findValue, 
'people' as tableName 
FROM people 
where people.name = "$search" 
UNION ALL 
SELECT city as findValue, 
'cities' as tableName 
FROM cities 
where cities .name = "$search" 

，你從所有的子查詢返回相同類型的字段是很重要的。有關更多信息，請參閱here，基本上這個想法是，您返回從查詢中找到的所有數據的UNION。