How to insert data into parent and child tables?
Then, the procedure should split the child level data based on the DepartmentType (“A” = insert into @ChildEmployeeDepartmentTypeA and “B” = insert into @ChildEmployeeDepartmentTypeB).
How is the relationship between parent and child table maintained?
The relationship between the child and the parent tables is maintained by checking the existence of the child table FOREIGN KEY values in the referenced parent table’s PRIMARY KEY before inserting these values into the child table.
How to create both parent and child rows in Oracle?
Oracle doesn’t allow conditional FKs. i.e. one column which could point at one table or another based on some other value. But you can enable this by creating extra columns on the parent. One per child table type, holding a copy of the primary key. The child tables can then have deferrable FKs pointing back to these.
How to ensure that both parent and child rows are created?
One per child table type, holding a copy of the primary key. The child tables can then have deferrable FKs pointing back to these. This guarantees the 1:1 relationship.
Is the ID unique in table _ a or table _ B?
Also, id is a unique in table_a, and not in table_b. table_A: table_B: table_C: id object id tag id object 1 lamp 1 furniture 3 stool 2 table 2 furniture 4 bench 3 stool 3 furniture 4 bench 4 furniture 4 chair 3 chair Alternatively, is there a better way to organise the data?
How to select table a from Table B?
Table A carries status information of a fleet of equipment. Each status record carries with it a start and stop time of that status. Table B carries regularly recorded, timestamped data about the equipment, which I want to extract for the duration of the period indicated in table A. Thanks for contributing an answer to Stack Overflow!
How to select from one table matching criteria?
In one of the replies here the solution is as follows: Table A carries status information of a fleet of equipment. Each status record carries with it a start and stop time of that status. Table B carries regularly recorded, timestamped data about the equipment, which I want to extract for the duration of the period indicated in table A.