Contents
- 1 How do I create a recursive query in Oracle?
- 2 How do I create a hierarchical query in Oracle?
- 3 What is level and connect by in Oracle?
- 4 How to retrieve all recursive children of parent row in Oracle SQL?
- 5 Which is a foreign key in the parent child table?
- 6 How to find correct table order list without Oracle ora-02266?
How do I create a recursive query in Oracle?
A recursive subquery factoring clause must contain two query blocks combined by a UNION ALL set operator. The first block is known as the anchor member, which can not reference the query name. It can be made up of one or more query blocks combined by the UNION ALL , UNION , INTERSECT or MINUS set operators.
How do I create a hierarchical query in Oracle?
START WITH specifies the root row(s) of the hierarchy. CONNECT BY specifies the relationship between parent rows and child rows of the hierarchy. The NOCYCLE parameter instructs Oracle Database to return rows from a query even if a CONNECT BY LOOP exists in the data.
What is level and connect by in Oracle?
The term LEVEL refers to a Pseudocolumn in Oracle which is used in a hierarchical query to identify the hierarchy level (parent->child) in numeric format. The CONNECT BY clause defines the hierarchical relationship between the parent rows and the child rows of the hierarchy.
How do I run an Oracle explain plan?
Running EXPLAIN PLAN EXPLAIN PLAN FOR SELECT last_name FROM employees; This explains the plan into the PLAN_TABLE table. You can then select the execution plan from PLAN_TABLE . This is useful if you do not have any other plans in PLAN_TABLE , or if you only want to look at the last statement.
How to get all parent-child tables in the database?
Can you please explain the way to get a list of all parent child relation in the database. The list should have the Grand parent as the first item and the last item will be the grand child. BDP_INFO is the parent to BAA and also Child to CONTR.
How to retrieve all recursive children of parent row in Oracle SQL?
How to retrieve all recursive children of parent row in Oracle SQL? I’ve got a recursive query that’s really stretching the limits of this Java monkey’s SQL knowledge. Now that it’s finally 1:30 in the AM, it’s probably time to start looking for some help. This is one of the few times Google has failed me.
Which is a foreign key in the parent child table?
FK_DIM_PRODUCT is a foreign key referring to DW_TBL_DIM_PRODUCT.SRL and FK_DIM_MARKET is a foreign key referring to DW_TBL_DIM_MARKET.SRL. There 6 markets (at parent level) so market_class has values from 1 to 6.
How to find correct table order list without Oracle ora-02266?
How can I find the correct table order list to truncate without oracle ORA-02266: unique/primary keys in table referenced by enabled foreign keys