SQL>createtabletest(id numbernotnull, name varchar2(16));Tablecreated.SQL>insertintotest(id, name)values(1,null);1rowcreated.SQL>insertintotest(id, name)values(2,'');1rowcreated.SQL>insertintotest(id, name)values(3,' ');--符号中' '有一个空格1rowcreated.SQL>insertintotest(id, name)v...
reload - This will reload the oracle listener SID and parameter files. This is equivalent to lsnrctl stop and lsnrctl start. save_config - This will save the current settings to the listener.ora file and also take a backup of the listener.ora file before overwriting it. If there are no c...
如上测试,SQL Server跟Oracle不一样,在SQL Server中,’’跟null是不一样的,空字符串是空字符串,null是null,SQL Server数据库中不会将长度为零的空字符串视为null。但是SQL Server在查询的时候比较空字符串时,长度为零的空字符串与长度为1的字符串,长度为N的字符串,它们似乎是等价的。跟Oracle的行为完全不一...
To achieve the throughput of up to one kilobyte (KB) of data per second for an absolute consistent read operation (i.e., where the data returned is expected to be the most recently written data to the database), the equivalent of two read units per month need to be provisioned. ...
Applies to: SQL Server A tablespace is a unit of database storage that is roughly equivalent to a file group in Microsoft SQL Server. Tablespaces allow storage and management of database objects within individual groups. For more information, see the Oracle documentation. When you configure a ...
简介:标签PostgreSQL , Oracle , nchar , nvarchar , ntext , ms sql , sybase , unicode character , utf8背景在Oracle, MS SQL, SYBASE数据库引擎中,有一些这样的字符串类型nchar , nvarchar , ntext。 标签 PostgreSQL , Oracle , nchar , nvarchar , ntext , ms sql , sybase , unicode character , ...
When migrating to Oracle PL/SQL, the Migration Workbench determines the base data type for each user-defined data type, and it finds the equivalent PL/SQL data type. Note: User-defined data types make the data definition language code and procedural SQL code less portable across different data...
There are a few datatypes that exist in SQL Server that do not have a direct equivalent counterparts in Oracle, but can be represented quite easily. These are theBIT,TIMESTAMPandUNIQUEIDENTIFIERdatatypes. The BIT datatype is usually represented by NUMBER(1) in Oracle systems as it simplifies co...
PawSQL Compatible with IntelliJ IDEA (Ultimate, Community), Android Studioand16 more
第一个child cursor总是使用0来表示其创建顺序,V$SQL.CHILD_NUMBER = 0。因此,当从V$SQL_PLAN中查找某个SQL的执行计划时,要注意你写对了CHILD_NUMBER。 如果有多个child cursor,则表示parent cursor有多个版本,v$sqlarea中的version_count字段就会纪录下来。