update groupuser as g1 join groupuser as g2 on (g1.user_id=1 and g2.user_id = 2)
or(g1.user_id = 2 and g2.user_id=1)
set g1.group_id = g2.group_id,g2.group_id=g1.group_id;
转载于:https://www.cnblogs.com/mybug/p/5980667.html
update groupuser as g1 join groupuser as g2 on (g1.user_id=1 and g2.user_id = 2)
or(g1.user_id = 2 and g2.user_id=1)
set g1.group_id = g2.group_id,g2.group_id=g1.group_id;
转载于:https://www.cnblogs.com/mybug/p/5980667.html
道可道，非常道；名可名，非常名。 无名，天地之始，有名，万物之母。 故常无欲，以观其妙，常有欲，以观其徼。 此两者，同出而异名，同谓之玄，玄之又玄，众妙之门。