MySQL的多功能表搜索

Question

table1 
ID 
SUBJECT 
CONTENT 

table2 
ID 
SUBJECT 
CONTENT 

table3 
ID 
SUBJECT 
CONTENT 

... 5 more 

我想對所有表

搜索 SUBJECT

我怎樣才能做到這一點？

Answer 1

select * from table1 where subject like '%match%' union 
select * from table2 where subject like '%match%' union 
select * from table3 where subject like '%match%' union 
select * from table4 where subject like '%match%' union 
select * from table5 where subject like '%match%' union 
select * from table6 where subject like '%match%' union 
select * from table7 where subject like '%match%' union 
select * from table8 where subject like '%match%' 

Answer 2

CREATE VIEW multitable AS 
SELECT * FROM table1 
UNION SELECT * from table2 
UNION SELECT * from table3; 

SELECT subject FROM multitable ... 

Answer 3

因爲所有的表都具有相同的語法，你可以使用UNION操作。

SELECT * FROM Table1 
UNION Table2 
UNION Table3 
UNION Table4 
UNION Table5 
UNION Table6 
UNION Table7 
UNION Table8 
WHERE SUBJECT="Subject" 

爲了簡單起見，8個表格並沒有太多要寫出來。如果你有更多，我會推薦dynamic query。