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string sql = "insert into judging (userid,name,password) values('" + userid.Text.Trim() + "','" + name.Text.Trim() + "','" + password.Text.Trim() + "')";
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string sql = "delete from judging where userid=" + app.value;
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string sql = "update judging set name='"+modifyname+"',password='"+modifypsw+"'where userid=" + app.value ;
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sql = "select * from judging where name='" + comboBoxName.Text + "' and userid='" + comboBoxID.Text + "'";
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string sql = "select userid as userid,name as name from judging";
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