union这个组合查询,会自动将重复的行去掉
使用union来组合两条select语句
string sql = string.Empty;
if (radioButton_UNION.Checked)
{
sql = $"select student_name from student_info where student_age >30 union select stude
2024-06-10 08:46:28
union这个组合查询,会自动将重复的行去掉
使用union来组合两条select语句
string sql = string.Empty;
if (radioButton_UNION.Checked)
{
sql = $"select student_name from student_info where student_age >30 union select stude