SQL修改数据表字段长度

alter table m_Assysn_t nocheck CONSTRAINT all Alter Table m_Assysn_t ALTER column ppid VARCHAR(150) alter table m_Assysn_t check constraint all Alter Table dbo.[T_STAT_ADMIN] ALTER column INIText VARCHAR(8000)

SUM操作的字符串到数值型的转换：
select sum(cast(变量 as bigint)) as 变量 from 表例：select sum(cast(studentid as bigint)) as he from student

2021-11-29
2022-12-23
2022-02-07
2022-12-23
2021-09-19
2022-01-23
2022-02-02
2021-12-12