如何在查询中生成序列号? [英] How to generate serial number in a query?
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问题描述
我们正在使用PostgreSQL v8.2.3.
We're using PostgreSQL v8.2.3.
如何在查询输出中生成序列号?我想为查询返回的每一行显示序列号.
How do I generate serial number in the query output? I want to display serial number for each row returned by the query.
示例: SELECT员工ID，姓名FROM员工
我希望针对每一行生成并显示序列号.
I expect to generate and display serial number against each row starting from one.
推荐答案
您有两个选择.
升级到PostgreSQL v8.4并使用 row_number()函数:
Either upgrade to PostgreSQL v8.4 and use the row_number() function:
SELECT row_number() over (ORDER BY something) as num_by_something, *
FROM table
ORDER BY something;
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