Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
931 views
in Technique[技术] by (71.8m points)

mysql - SQL query dynamic table name in FOR

I have a table tbl1 which has a column tbl_names. This column contains the name of some other tables.
Now I want to write a query in the following format:
select * from (select tbl_names from tbl1)

I know that the query above will not work but how I can achieve this? Do I need to write a stored procedure or something like that and loop on each value of second query and execute first query?

Thanks

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

You can use prepared statements

SET @a = (select tbl_names from tbl1);
SET @x := CONCAT('SELECT * FROM ', @a);
Prepare stmt FROM @x;
Execute stmt;
DEALLOCATE PREPARE stmt;

PREPARE Syntax

Cheers.


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...