我有以下情况:@Entity(name = "BaseEntity")@DiscriminatorColumn(name="DISCR_COLUMN", discriminatorType = DiscriminatorType.STRING)@DiscriminatorOptions(insert = true,force=true)
public abstract class Base imp
我在MySQL表中有两列,一个是startDay varchar(10),比如"2020-03-23",另一个是orderId archer(20),它们都可以为空 select * from table where orderId is null and startDay < '2020-03-23'
select * from tablewhere orderId is not null and startDay <