$ This-& amp; gt; db-& amp; gt; join (

1 Syntax: $ this-db-join (table2, table2.col1table1. col2, join type) The third parameter is an optional parameter, which has the following values: left, right, outer, inner, left, outer, leftouter, and rightouter2: to use multiple connections in a query, you can call $ this-db-join (

1 Syntax: $ this-db-join ('table2', 'table2. col1 = table1.col2 ', 'join type') The third parameter is an optional parameter with the following values: left, right, outer, inner, left, outer, left outer, right outer 2 usage: If you want to use multiple connections in the query, you can call $ this-db-join (

1Syntax:

$ This-> db-> join ('table2', 'table2. col1 = table1.col2 ', 'join type') The third parameter is an optional parameter with the following values: left, right, outer, inner, left, outer, left outer, right outer

2Use:

To use multiple connections in a query, you can call $ this-> db-> join () multiple times ()

3Example: