摘要：
DROP PROCEDURE IF EXISTS update_address_byid;CREATE PROCEDURE update_address_byid( id_param INT, username_param VARCHAR(50), name_param VARCHAR(50), sex_param VARCHAR(10), mobile_param VARCHAR(20), email_param VARCHAR(50), qq_param VARCHAR(20), company_param VARCHAR(100), ... 阅读全文
摘要：
select CONCAT(field1, '@', field2) as aafrom table_name 阅读全文