Test your knowledge of Apache Impala.
A subquery is a SQL query that runs within another query. They are nested inquiries that offer data to the query that comes before it.
TRUNCATE TABLE is a Data Definition Language operation in SQL that marks the extent of a table for deallocation. This operation removes all data from
You can apply an alias to tables, columns, or column expressions when you enter their names in a query. When making further references to the
In OLTP databases, DELETE is one of the most commonly used DML commands. When it comes to OLAP databases, however, DELETE is used less frequently.
In OLTP databases, UPDATE is one of the most commonly used DML commands. When it comes to OLAP databases, however, UPDATE is used less frequently.