Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement. It’s sometimes difficult to know which SQL syntax to use when ...

SELECT options refine results As we saw in the last article, the SQL SELECT ... use this statement while selecting multiple column names and use multiple columns to group the function results.

Spark supports a SELECT statement and conforms to the ANSI SQL standard. Queries are used to retrieve result sets from one or more tables. The following section describes the overall query syntax and ...