Got a request from the boss today to extract all users plus their contact numbers from the Paging server<\/p>\n
Server is a Red Hat Enterprise Linux AS release 4, running LAMP.<\/p>\n
The data needed are located in several tables, so we need to query all relevant tables in the databse:<\/p>\n
mysql> SELECT users.username, users.emailaddress, user_services.current_service FROM users, user_services WHERE users.username=user_services.username<\/p><\/blockquote>\n
The statement above queries two tables – users<\/em> and user_services<\/em>, as show from the expressin ‘FROM users, user_services’. The record in users table that information is required are in the username and emailaddress record. On user_services, it’s current_services. The WHERE sets the limit condition.<\/p>\n
To send that output to a file, we use the INTO OUTFILE ‘<\/path\/to\/file>’.<\/p>\n
So, that’s<\/p>\n
mysql> SELECT users.username, users.emailaddress, user_services.current_service FROM users, user_services WHERE users.username=user_services.username INTO OUTFILE ‘\/tmp\/tempfile.txt’<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"
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