ORACLE/SQL Server中的减号与例外差异 、、、 减号是一个SQL集合操作,它从第一个表中选择元素,然后删除Oracle中第二个SELECT语句返回的行。在SQL Server中,我们可以使用EXCEPT来做同样的事情。在将我的项目从oracle迁移到SQL Server时,我注意到了一个不同之处。如果第一个结果集没有记录,减号将带来第二个...
SQL>selectename,sal,sal+300fromemp; 1. 运算符的优先级 跟数学中的概念一样,乘除优先于加减,可以使用括号改变优先级 示例四、 SQL>selectename,sal,sal*12+300fromemp;ENAME SAL SAL*12+300--- --- ---SMITH8009900ALLEN160019500WARD125015300JONES297536000 1. 2. 3. 4. 5. 6. 7. 8. SQL>select...
- dynamic sampling used for this statement (level=2) Statistics --- 0 recursive calls 0 db block gets 28 consistent gets 0 physical reads 0 redo size 792 bytes sent via SQL*Net to client 419 bytes received via SQL*Net from client 2 SQL*Net roundtrips to/from client 1 sorts (memory) ...
After each stage of execution, the cursor retains enough information about the SQL statement to re-execute the statement without starting over, as long as no other SQL statement has been associated with that cursor. This is illustrated in Figure 7-1. Notice that the statement can be re-...
sql>select * from SESSION_ROLES; //查看当前用户的生效的角色。 修改指定用户,设置其默认角色 sql>alter user user1 default role role1; sql>alter user user1 default role all except role1; 删除角色 sql>drop role role1; 角色删除后,原来拥用该角色的用户就不再拥有该角色了,相应的权限也就没有了...
4 convert-sql-statement ConvertSQLReport<n>.XML 5 synchronize-target TargetSynchronizationReport<n>.XML 6 refresh-from-database SourceDBRefreshReport<n>.XML 重要 輸出報表與評量報表不同。 前者是已執行命令效能的報表,而後者則是供程式設計取用的 XML 報表。 如需輸出報表的命令選項 (從上述 Sl 第 2...
1-43 Chapter 1 Action: Check for a typographical error, and refer to the SQLEXEC reference documentation for help with syntax. OGG-00345: Error in SQLEXEC clause, id {0}: SPNAME or QUERY is required The SQLEXEC statement does not contain a clause that specifies whether it will execute ...
When the statement executes, string literals are converted to an internal format and are then properly decoded to Unicode.Known issues and limitationsThe following list describes some known limitations for the Oracle Datbase connector:Not supported: Any table with composite keys Nested object types in...
这里比较关键的信息是第二行错误信息的错误代码:"PARSE ERROR: ospid=969851, error=903 for statement",这个例子中,它提示SQL解析出错是因为遇到了ORA-903这个错误 $ oerr ora 90300903,00000,"invalid table name"// *Cause: A table or cluster name was invalid or does not exist.// This message was ...
Statements may be slightly faster if you are only going to execute the SQL once. PreparedStatements are much faster when the SQL will be executed more than once. If you are using the statement cache, which you should, getting a statement from the cache is the same as executing the same ...