们知道,从Oracle9i开始,对于外连接(Outer join)Oracle支持SQL92标准:这个标准有很多新的连接语法,当然不仅是外连接了,这里,我主要讨论的是外连接的新语法:Left Outer Join和Right Outer Join,Full Outer Join这里不会讨论,我会额外总结所有的SQL92新的连接语法。对于接触Oracle比较早的开发人员或DBA来说,外连接用+号...
(To use the query_partition_clause in an analytic function, use the upper branch of the syntax (without parentheses). To use this clause in a model query (in the model_column_clauses) or a partitioned outer join (in the outer_join_clause), use the lower branch of the syntax (with p...
Oracle官方提供了两种方式来实现外连接,一种是在where子句中使用Join操作符(+),另一种是在from子句中使用left outer join/right outer join/full outer join。第二种方式是通用的,也是Oracle官方建议的:Oracle recommends that you use the FROM clause OUTER JOIN syntax rather than the Oracle join operator;而...
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The Informix Dynamic Server ESQL/C OUTER JOIN syntax is different from Oracle Pro*C. The following table compares the OUTER JOIN syntax in Informix Dynamic Server and Oracle: Note: In release 9.2.0.1.0 of the Migration Workbench, you must manually add the plus sign. ...
This SQL query performs a left outer join between the emp_mast (employee master) table and the dep_mast (department master) table using the old Oracle syntax for outer joins. The query selects the employee number, employee name, job name, department name, and location. ...
Oracle RIGHT OUTER JOIN with USING clause Similar to other joins such asINNER JOIN,LEFT JOIN, you can use theUSINGclause to specify which column to test for equality when joining tables. The following illustrates the syntax of theRIGHT OUTER JOINwith theUSINGclause: ...
select a.ENAME,b.ENAME from emp a,emp b where a.MGR=b.empno(+);--外连接 内表或俩表比较有+端强制显示空结果 select a.ENAME as ben,b.ENAME as shangji from emp a,emp b where a.MGR=b.empno(+) and a.hiredate
当查看 2的执行方案时发现两个表均为全表扫描。不过我在oracle9.2自带的SQL Referrence.pdf的第511页上看到有这样一 句: Oracle Corporation recommends that you use the FROM clause OUTER JOIN syntax rather than the Oracle join operator.-前者选择的优化器是RULE,而后者选择的优化器是 CBO的ALL ROWS 0...
Here,phones_ntabspecifies the attributes of thephones_ntabnested table. To retrieve even parent rows that have no child rows (no phone numbers, in this case), use the outer join syntax, with the+. For example: SELECT p.name_obj, n.num ...