I have a table named alumnidetails with columns(username,firstname,mobile,email) and another table alumwork with columns(username,work,course,branch). Now i want to select data from both tables. I have only firstname value. What is the sql query. Please help me out.I have a table named alumnidetails with columns
阅读背景：
SQL Query从已知单列的两个表中选择数据
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