MSSsql常用代码1

1.SQLServer 2008获取自身信息：
    select   b.[value] from sys.columns a left join sys.extended_properties b on a.object_id=b.major_id
            and a.column_id=b.minor_id inner join sysobjects c on a.column_id=c.id
            and a.[name]='列名' and c.[name]='表名'
            SELECT
            表名=case   when   a.colorder=1   then   d.name   else   ''   end,
            表说明=case   when   a.colorder=1   then   isnull(f.value,'')   else   ''   end,
            字段序号=a.colorder,
            字段名=a.name,
            标识=case   when   COLUMNPROPERTY(   a.id,a.name,'IsIdentity')=1   then   '√'else   ''   end,
            主键=case   when   exists(SELECT   1   FROM   sysobjects   where   xtype='PK'   and   name   in   (
            SELECT   name   FROM   sysindexes   WHERE   indid   in(
            SELECT   indid   FROM   sysindexkeys   WHERE   id   =   a.id   AND   colid=a.colid
            )))   then   '√'   else   ''   end,
            类型=b.name,
            占用字节数=a.length,
            长度=COLUMNPROPERTY(a.id,a.name,'PRECISION'),
            小数位数=isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0),
            允许空=case   when   a.isnullable=1   then   '√'else   ''   end,
            默认值=isnull(e.text,''),
            字段说明=isnull(g.[value],'')
            FROM   syscolumns   a
            left   join   systypes   b   on   a.xusertype=b.xusertype
            inner   join   sysobjects   d   on   a.id=d.id     and   d.xtype='U'   and     d.name<>'dtproperties'
            left   join   syscomments   e   on   a.cdefault=e.id
            left   join   sys.extended_properties   g   on   a.id=g.major_id   and   a.colid=g.minor_id
            left   join   sys.extended_properties   f   on   d.id=f.major_id   and   f.minor_id=0
            --where   d.name='orders'         --如果只查询指定表,加上此条件
            order   by   a.id,a.colorder
2.截取时间年份：
    DATENAME(YEAR,CA_CreateOn)='2015'
3.日期相等：
    Convert(varchar(10),level_time,120)='2014-07-17'
4.随机取数：
    select top n * from tableA order by newid()
5.insert into select:
    insert into qclist(qcid,svo_id,speaker_id,[status])
    select top 589 4 as qcid,level_uid as svo_id,tab1.id as speaker_id,0 as [status]  from (
    select speaker.id as id,speaker.level_uid,level_time from speaker left join [level] on speaker.id=[level].speaker_id where level_code>0 and [level].qc_status=0) tab1
    right join [user] on tab1.level_uid=[user].id where role_id=2
    and level_uid in (6,7) 
    and level_time between '2014-07-17' and '2016-01-24' order by newid()
6.SELECT SCOPE_IDENTITY():返回上面操作的数据表最后row的IDENTITY 列的值；
7.分类统计：
    select COUNT(distinct qc_id) as amend_count,qc_id from qclist where amend_status=0 group by qc_id;
8.两表更新：
    update speaker set qc_status=qclist.status,qc_time=getdate(),qc_uid={$qc_userid},level_take_uid=0,vf_of_ta=1 from qclist where speaker.id=qclist.speaker_id and qclist.qc_id=$qc_id;
9.修改表字段长度：
    alter table bu alter column realname nvarchar(200);
10.添加字段：
    alter table speaker add  qc_status INT default 0,qc_time datetime,qc_uid int,BusinessID varchar(200),is_block int,credentials_type varchar(200),summary varchar(4000),level_status int,check_status INT default 0,check_num int default 0,is_unblock tinyint default    0;
11.更改标识种子：
    DBCC CHECKIDENT (speaker,RESEED,80);
12.SQL判断：
    select CONVERT(varchar(10),speaker.level_time,23) as CompleteDate,etms_code,
    speaker.name,institution.name,department.name,
    case occupation when 1 then 'Practicians' when 2 then 'Pharmacists' when 3 then 'Scientists'
    when 4 then 'Health Access Expert/Economist' when 5 then 'Paramedical/ others' end as Category,
    case when mm_level>0 then mm_level else experts_level end as Level,case when if_gov=2 then 'Y' else 'N' end as GOVBG
     from speaker
    left join level on speaker.id=level.speaker_id 
    left join institution on institution.id=speaker.institution_id
    left join department on department.id=speaker.department
    where experts_level is not null and experts_level<>0 
13.union 使用：
    select inter_log.businessid,department.name,etms_code,'Reject' as [status] from inter_log 
    left join speaker on speaker.businessid=inter_log.businessid
    left join department on department.id=speaker.department
    where oper_type in ('驳回重审','驳回上级') and inter_log.status=1
    union
    select inter_log.businessid,department.name,etms_code,'Approve' as [status] from inter_log 
    left join speaker on speaker.businessid=inter_log.businessid
    left join department on department.id=speaker.department
    where oper_type='评级' and inter_log.status=1
    union
    select speaker.BusinessID,department.name,etms_code,'In Process' as [status] from speaker
    left join department on department.id=speaker.department
    where BusinessID not in (select BusinessID from inter_log where oper_type in ('驳回重审','驳回上级','评级')) and BusinessID is not null
14.计算非重复数据：
    select name,[user].id,start_time,end_time,ISNULL(pass_percent,0) as pass_percent,qc.id as qc_id,isnull(reject_count,0) as reject_count,list_type from qc
    left join [user] on[user].id=qc.qc_userid 
    left join (select COUNT(id) as reject_count,qc_id from qclist where [status] in (2,4) group by qc_id) tab1 on tab1.qc_id=qc.id
    left join (select COUNT(distinct qc_id) as amend_count,qc_id from qclist where amend_status in (0,1) group by qc_id) tab2 on tab2.qc_id=qc.id
    where [user].id=23 and qc.status=0 and amend_count in (1,2)