1、修改表字段类型

 /*修改原字段名name为name_tmp*/ alter table CA_CaDocument rename column cd_taskids to cd_taskids_T ;

/*增加一个和原字段名同名的字段name*/ alter table CA_CaDocument add cd_taskids Nvarchar2(500);

/*将原字段name_tmp数据更新到增加的字段name*/ update CA_CaDocument set cd_taskids=trim(cd_taskids_T);

/*更新完，删除原字段name_tmp*/ alter table CA_CaDocument drop column cd_taskids_T;

 

2、查询表字段类型  某一类型

select TABLE_NAME,COLUMN_NAME from information_schema.columns WHERE DATA_TYPE LIKE ‘nvarchar‘

AND (CHARACTER_MAXIMUM_LENGTH=-1 OR CHARACTER_OCTET_LENGTH=-1) ORDER BY TABLE_NAME;

 

select table_name,column_name,data_type,DATA_LENGTH From all_tab_columns

where  data_type =‘NCLOB‘

 

3、 查询oracle 行数

select

nvl(

case(t.table_name)

when Upper(‘T_InnerTestScoreStdConfig‘) then Upper(‘T_InnerTestScoreStandardConfig‘        )

end,

t.table_name),count_rows(table_name)

 from user_tables t order by t.table_name desc

 

4、查询sql 行数

create table #t(name nvarchar(255), rows bigint, reserved varchar(20), data varchar(20), index_size varchar(20), unused varchar(20))

 exec sp_MSforeachtable "insert into #t exec sp_spaceused ‘?‘"

 select  Upper(name), rows from #t where name in (‘T_SettlementInformItem‘,

‘PPM_SupplierConfirm‘,

‘CA_DocSign‘,

‘T_Todo‘,

‘T_Task‘,

‘SP_RectifyNodeInfo‘) order by name desc

 drop table #t

 

5、数据导入临时表

 

SELECT * INTO new_table_name  FROM old_tablename   where ......   (表名不能以#  开头)