Simple joining of data from two different tables on basis of a common key

SELECT a.user_id,a.meta_value,b.user_login FROM `e_usermeta` a,`e_users` b where a.meta_key="phoneno" and a.user_id=b.ID

SELECT a.user_id,a.meta_value,b.user_pass,b.user_login FROM `e_usermeta` a,`e_users` b where a.meta_key="phoneno" and a.user_id=b.ID order by b.user_login

UPDATE `wp_users` a,`tmptable` b SET a.`user_pass`=b.`usp` where a.`user_login`=b.`ulogin`;

Simple joining of data from two different tables on basis of a common key

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