There are occasions when one may want to calculate months with more than 28 days in SQL server. The challenge that may arise is that a generic T-SQL function does not exist for this computation. Nonetheless, the ability to perform such computation is made possible through the proper use of date functions in T-SQL, combined with the ability to leverage cursors or a looping construct within a stored procedure.
In this post, we shall be focusing on how to count the number of months in SQL Server with a duration of more than 28 days. We shall start by creating a cursor to loop through each year and month, and then use a combination of several date functions to achieve the desired outcome.
首先,我们创建一个游标来循环每一年和每一个月:
— Declare Cursor declare c1 cursor for select distinct year(date) as [year], month(date) as [month] from tablename order by [year], [month]
接下来,我们使用dateadd函数来计算每个月的总天数:
declare @days int, @month date set @month = dateadd(mm, 1, datefromparts(@year, @month, 1)) set @days = datediff(dd, datefromparts(@year, @month, 1), @month)
随后,我们通过比较总天数是否大于28来判断每个月是否包含天数大于28天:
if @days > 28 begin — Increment the count set @longmonthcount = @longmonthcount + 1 end
最后,我们返回结果:
— Return result select @longmonthcount count
因此,以上代码是如何用游标和dateadd函数统计超过28天的月份。这种方法可以确保实现这种统计。
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sql 计算出某个时间的到期日?
select p_id,p_sdate,case when year(dateadd(mm,6,p_sdate))<=year(getdate()) then dateadd(mm,6,p_sdate) else cast(cast(year(p_sdate)+1 as char(4))+-02-28 as datetime) endas p_edate,case when dateadd(mm,6,p_sdate))
1、 打开命令行窗口 #db2CMD 2、 打开控制中心 # db2cmd db2cc 3、 打开命令编辑器 db2cmd db2ce =====操作数据库命令===== 4、 启动数据库实例 #db2start 5、 停止数据库实例 #db2stop 如果你不能停止数据库由于激活的连接,在运行db2stop前执行db2 force application all就可以了 /db2stop force 6、 创建数据库 #db2 CREATE db [dbname] 7、 连接到数据库 #db2 connect to [dbname] user [username] using [password] 8、 断开数据库连接 #db2 connect reset 9、 列出所有数据库 #db2 list db directory 10、 列出所有激活的数据库 #db2 list active db2 export to of del select * from cmmcode where codtp=01 db2 export to of del modified by coldel| select * from cmmcode where codtp=01 三、查询数据结构及数据: db2 select * from btpoper db2 select * from btpoper where brhid= and oprid=0001 db2 select oprid,oprnm,brhid,passwd from btpoper 四、删除表中数据: db2 delete from btpoper db2 delete from btpoper where brhid= or brhid= 五、修改表中数据: db2 update svmmst set prtlines=0 where brhid= and jobtp=02 db2 update svmmst set prtlines=0 where jobtp=02 or jobtp=03 六、联接数据库 db2 connect to btpdbs 七、清除数据库联接 db2 connect reset 断开数据库连接 db2 terminate 断开数据库连接 db2 force applications all 断开所有数据库连接 八、备份数据库 1、 db2 backup db btpdbs 2、 db2move btpdbs export db2look -d btpdbs -e -x [-a] -o 九、恢复数据库 1、 db2 restore db btpdbs without rolling forward 2、 db2 -tvf 文件内容:create db btpdbs on /db2catalog db2 -stvf db2move btpdbs import 十、DB2帮助命令: db2 ? db2 ? restroe db2 ? sqlcode (例:db2 ? sql0803) 注:code必须为4位数,不够4位,前面补0 十一、bind命令:将应用程序与数据库作一捆绑,每次恢复数据库后,建议都要做一次bind (1) db2 bind (2) /btp/bin/bndall /btp/bnd /btp/bin/bndall /btp/tran/bnd 十二、查看数据库参数: db2 get dbm cfg db2 get db cfg for btpdbs 十三、修改数据库参数: db2 update db cfg for btpdbs using LOGBUFSZ 20 db2 update db cfg for btpdbs using LOGFILSIZ 5120 改完后,应执行以下命令使其生效: db2 stop db2 start
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