MySQL打字位变成横杠

第一情况输入横杠时，需将输入法调整到英文状态，然后按住Shift(上档键)，再按横杠键了。第二种情况先按下下划线按钮(使其处于选中状态)，然后再去输入我们希望的内容，这时候我们键入的内容底部，就出现下划线了但是不再需要输入时，再次点击下划线，时期不被选中就可以了

用这个吧，肯定可以update grade set life_a=(select life_a from grade where id=1),life_a=(select life_a from grade where id=1),life_b=(select life_b from grade where id=1),life_c=(select life_c from grade where id=1),life_grow_a=(select life_grow_a from grade where id=1),life_grow_b=(select life_grow_b from grade where id=1),life_grow_c=(select life_grow_c from grade where id=1),phy_min_a=(select phy_min_a from grade where id=1),phy_min_b=(select phy_min_b from grade where id=1),phy_min_c=(select phy_min_c from grade where id=1)where id=2

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