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Example definition for get data from two tables :
Get 109 user_id user details from two tables, detail get in following sequence user_id, firstname from user table and company_name, company phone from company table.
Example table for get data from two tables :
Here is two example table structure given, both table have one common field i.e., user_id
Table: user Fields: user_id | firstname | lastname | date_create.... Table: company Fields: company_id | user_id | company_name | phone | address | date_create....
MySQL query for get data from two tables :
SELECT u.user_id, u.firstname, c.company_name, c.phone FROM company c LEFT JOIN user u ON ( c.user_id = u.user_id ) WHERE c.user_id = 109
MySQL LEFT JOIN query explanation
u.user_id, u.firstname :
We set alias ‘u’ for user table, use ‘u.USER_TABLE_FIELD_NAME’ for access fields
c.company_name, c.phone :
We set alias ‘c’ for user table, use ‘c.COMPANY_TABLE_FIELD_NAME’ for access fields
company c :
Set company table alias ‘c’
user u :
Set user table alias ‘u’
LEFT JOIN user u ON ( c.user_id = u.user_id ) :
Set left join with user table based on common field ‘user_id’
c.user_id = 109 :
Set condition for get only 109 user_id record