1.非空约束 该字段的内容不允许为空 DROP TABLE t_student; CREATE TABLE t_student( id number(5) , – 学生编号 name varchar2(20) not null, – 学生的姓名 age number(2) default 18, – 学生的年龄 address varchar2(100), – 学生的地址 gender char(3) default ‘男’ ); – SQL语句结束 ...
接下來,透過 Oracle 伺服器上的 INVENTORY 資料表,建立名為 iventory_ora 的外部資料表。SQL 複製 CREATE EXTERNAL TABLE [inventory_ora] ([inv_date] DECIMAL(10,0) NOT NULL, [inv_item] DECIMAL(10,0) NOT NULL, [inv_warehouse] DECIMAL(10,0) NOT NULL, [inv_quantity_on_hand] DECIMAL(10,...
oracle常用经典SQL查询本篇文章是本人在工作中真理整理的一些常用的查询SQL语句如果喜欢记得收藏点赞分享关注哦 1、查看表空间的名称及大小select t.tablespace_name, round(sum(bytes/(1024*1024)),0) ts_sizefrom dba_tablespaces t, dba_data_files dwhere t.tablespace_name = d.tablespace_namegroup by t....
exmple: create tablespace userdata datafile '$ORACLE_HOME/oradata/userdata01.dbf' size 100M AUTOEXTEND ON NEXT 5M MAXSIZE 200M; create tablespace userdata datafile '$ORACLE_HOME/oradata/userdata01.dbf' size 100M extent management dictionary default storage(initial 100k next 100k pctincrease 10) of...
This query uses grouping to determine every distinct server stored in the Url column of the UrlTable table. 複製 select distinct dbo.RegexGroup( [Url], N'https?://(?<server>([\w-]+\.)*[\w-]+)', N'server' ) from [UrlTable] You can also use this funct...
QueryStringParameter ConvertEmptyStringToNull="True|False" DefaultValue="string" Direction="Input|Output|InputOutput|ReturnValue" Name="string" QueryStringField="string" Size="integer" Type="Empty|Object|DBNull|Boolean|Char|SByte| Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64| Single|Double|Decimal|...
Lock a table or view, temporarily limiting access by other users (LOCKTABLE). The following example uses DML to query theemployeestable. The example uses DML to insert a row intoemployees, update this row, and then delete it: SELECT * FROM employees; INSERT INTO employees (employee_id, las...
The Oracle 64 Bit client is required in order to run packages on a 64-bit computer. If you run the package in 32-bit mode, you do not need the Oracle 64 Bit client.In summary, if you want both to develop and to run SSIS packages on a 64-bit computer:Install the Attunity Oracle ...
After indicating that your transaction is read-only, you can execute as many queries as you like against any database table, knowing that the results of each query in the read-only transaction are consistent with respect to a single point in time....
In this section, you create a new table called DEPENDENTS. You create columns in the DEPENDENTS table. Your table will have the columns ID, FIRST_NAME, LAST_NAME, BIRTHDATE, and RELATION. Later, you create a foreign key on the DEPENDENTS table to associate the column's values with the ...