php - MySQL: information_schema.columns bugs?

Question

Why information_schema.columns always duplicates the result? For instance,

SELECT column_name 
FROM information_schema.columns 
WHERE table_name = 'root_blocks'

I will get this,

column_name

blc_id
blc_email
cat_id
blc_created
blc_updated
blc_id
blc_email
cat_id
blc_created
blc_updated

The duplicates go unpredictable on other tables when I try to query through phpmyadmin.

How can I make it not to duplicate?

Thanks.

EDIT:

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score 4 · Accepted Answer

SELECT column_name 
FROM information_schema.columns 
WHERE table_name = 'root_blocks'
AND `table_schema` = 'SCHEMA_NAME'

请试试这个。

如果您想从所有数据库中选择并获取唯一的列名，那么请试试这个..

SELECT DISTINCT(column_name) 
    FROM information_schema.columns 
    WHERE table_name = 'root_blocks'

score 2 · Accepted Answer

也许您在多个模式中有同一个表？

如果你运行会发生什么：

SELECT table_schema, column_name 
FROM information_schema.columns 
WHERE table_name = 'root_blocks'

2 回答 2