Simplifying this query?

Question

Consider this query:

SELECT table1.id, 
       table1.review, 
       table1.time, 
       table2.author, 
       table2.title 
FROM 
table1, table2 
WHERE table1.id = table2.id 
AND table1.reviewer = '{$username}'
ORDER BY table1.id

I'm using the above quite a lot around my site's code. I find that adding the table prefixes etc. before the column names can make the query very long and take up quite a lot of lines.

有没有办法使上述查询更简单/更容易？

Answer 1

首先,您可能希望为表提供更短的别名.此外,您使用的是隐式连接语法,这会使WHERE子句复杂化,因此一般不推荐使用.您可能希望使用更现代的显式语法:

SELECT    t1.id, t1.review, t1.time, t2.author, t2.title 
FROM      table1 AS t1
JOIN      table2 AS t2 ON (t2.id = t1.id)
WHERE     t1.reviewer = '{$username}'
ORDER BY  t1.id

请注意,它JOIN是同义词INNER JOIN,AS关键字在定义表别名时是可选的.你可以简单地使用 ... FROM table1 t1 ...而不是... FROM table1 AS t1 ....