1 数据准备
1.1 创建表
create table t_VOUCHER
(
expense VARCHAR(32) not null,
department VARCHAR(32),
debit int,
credit int
);
1.2 插入数据
insert into t_VOUCHER values ('材料费','生产部',10,20);
insert into t_VOUCHER values ('材料费','生产部',15,10);
insert into t_VOUCHER values (