Oracle “CONNECT BY” 使用 Oracle “CONNECT BY”是层次查询子句,一般用于树状或者层次结果集的查询。其语法是:1 2 [ START WITH condition ] CONNECT BY [ NOCYCLE ] conditionThe start with .. connect by clause can be used to select data that has a hierarchical relationship (usually some sort of...
注意:在分层查询中,不要指定 ORDER BY 或 GROUP BY,因为它们会覆盖 CONNECT BY 结果的分层顺序。 如果要对同一父级的兄弟行进行排序,请使用 ORDER SIBLINGS BY 子句。 请参见 order_by_clause。 3. Hierarchical 例子 3.1CONNECT BY Example 以下分层查询使用 CONNECT BY 子句来定义员工和经理之间的关系: SELECT...
Oracle “CONNECT BY”是层次查询子句,一般用于树状或者层次结果集的查询。其语法是:1 2 [ START WITH condition ] CONNECT BY [ NOCYCLE ] conditionThe start with .. connect by clause can be used to select data that has a hierarchical relationship (usually some sort of parent->child (boss->...
14、tion by Order by Rows Between Preceding And Following )五、相邻记录之间比较方面:Lag(Sum( ), 1) Over(Patition by Order by )1.分析函数(OVER)一.分析函数语法:FUNCTION_NAME(&l15、t;argument>,<argument>.)OVER(<Partition-Clause><Order-by-Clause><Windowing Clause>)例:sum(sal) over (...
connect by parentmenuid = prior menuidOracle “CONNECT BY” 使用Oracle “CONNECT BY”是层次查询子句,一般用于树状或者层次结果集的查询。其语法是:? 1 2 [ START WITH condition ] CONNECT BY [ NOCYCLE ] condition The start with .. connect by clause can be used to select data that has a hier...
CONNECT BY PRIOR EMPNO = /* current */ MGR that will take all of the PRIOR records (the start with at first) and find all records such that the MGR column equals their EMPNO (find all the records of people managed by the people we started with). ...
■ A SELECT statement with a GROUP BY clause or ORDER BY clause ■ A SELECT statement that is combined with another SELECT statement with the UNION, INTERSECT, or MINUS set operator ■ The WHERE clause of a SELECT statement ■ The DEFAULT value of a column in a CREATE TABLE or ALTER TAB...
connect_by_iscycle(存在循环,将返回1,否则返回0) The CONNECT_BY_ISCYCLE pseudocolumn returns 1 if the current row has a child which is also its ancestor. Otherwise it returns 0. You can specify CONNECT_BY_ISCYCLE only if you have specified the NOCYCLE parameter of the CONNECT BY clause. NOC...
To mitigate against this I added an additional condition on the CONNECT BY clause requiring that the customer not be ‘1’. select vendor, customer, level, connect_by_isleaf as isleaf, connect_by_iscycle as iscycle, connect_by_root vendor||sys_connect_by_path(customer,' ~ ') as path ...
(SELECT /*+ IGNORE_WHERE_CLAUSE NO_PARALLEL("T1") FULL("T1") NO_PARALLEL_INDEX("T1") */ :"SYS_B_5" AS C1, CASE WHEN "T1"."N"=:"SYS_B_6" OR "T1"."N"=:"SYS_B_7" THEN :"SYS_B_8" ELSE :"SYS_B_9" END AS C2, "T1"."ID" AS C3 FROM "BDATAGER"."T1" "T1"...