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How can we get parent and child records in single query using SQL?
“how to get parent and child record in single query using sql” Code Answer
- SELECT child. Id,
- child. Name,
- child. ParentId,
- parent. Name as ParentName.
- FROM your_table child.
- JOIN your_table parent ON child. ParentId = parent. id;
What is parent/child hierarchy?
A parent-child hierarchy is a hierarchy with multiple levels that track the relationships within the hierarchy. For example, in a hierarchy that represents an organizational structure, you can have two levels: Manager and Employee. The Manager level is the parent level, and the Employee level is the child level.
What is parent and child table in database?
Child tables and parent tables are just normal database tables, but they’re linked in a way that’s described by a parent–child relationship. It’s usually used to specify where one table’s value refers to the value in another table (usually a primary key of another table).
How to structure query for parent child relation?
How can I structure the query to return that type of result set for all parent child records in the table?
How to find all parents, children using SQL query?
It will not only find Parent of children for a particular level but you can use it to find both till N level. For the users, who want to work with hierarchical data relationships, this will work like a dream. For my example, I will create two tables to manage Master and relationship entries.
How to keep parent child relation in same table?
Like this you don’t lose the relation between the parent and the child record. Since you know that parents are enrolled and children not, returing the enrolled column adds no new information. If you want to keep your original result table shape, use an additional column for sorting
How to find all parents of a particular record?
For those who require to get only Query Part 1: Find only Parents of a particular record The following query is used to get the record and it’s all parent category records from the above tables. This query will produce a result as follows.