What is complex query?

What is complex query in SQL with example?

Complex Queries in SQL ( Oracle ) These questions are the most frequently asked in interviews. To fetch ALTERNATE records from a table. ( EVEN NUMBERED) select * from emp where rowid in (select decode(mod(rownum,2),0,rowid, null) from emp);

What is simple and complex queries?

There are 2 types of Views in SQL: Simple View and Complex View. Simple views can only contain a single base table. Complex views can be constructed on more than one base table. In particular, complex views can contain: join conditions, a group by clause, a order by clause.

What is complex query support?

Complex queries help to narrow a detailed listing obtained as output from an API. To generate the desired output, you can pass queries using And or Or operators in the input XML of an API.

How do you write a complex select query?

Treat complex parts as black boxes – they will return what they need to and you'll write (and incorporate into the main query) them later. Identify all the tables you'll need in the query. Join tables containing the data you need to display or the data used in the WHERE part of the query.