合并来自2个表的数据？

Question

I've been duplicating my data as as noted by the asterisk * below in Snippet 1 . This duplication allowed me to run a simple query as such:

"SELECT * FROM tweets ORDER BY time DESC LIMIT 7",

This populates 7 tweets as a default setting.

However, I want to eliminate these redundant columns. To do this I need to pull the other fields from the credentials table.

How would I run a complex query like this? Is this feasible? Is it a good idea?

Snippet 1

Table 1 - tweets (7)

id
h_token
h_file    *remove and pull from credentials
picture   *remove and pull from credentials    
name      *remove and pull from credentials
tweet
time 



Table 2 -  credentials (12)


id
name
email
h_pass
picture
privacy
h_token
h_file
special
page
pane
remember

Each tweet has an h_token associated with it that will be used to add relational data (h_file, name, and picture)

Answer 1

You need to use a join operation, like so:

SELECT tweets.*, credentials.h_file, credentials.picture, credentials.name 
    FROM tweets JOIN credentials ON tweets.h_token=credentials.h_token 
    ORDER BY time DESC LIMIT 7;

This is basically your original query, but adding three columns from the credentials table whenever the h_token from the credential and tweets table match up......