Databricks Certified Data Engineer - Associate

Explanation

The correct answer is A because:

1. INSERT INTO my_table VALUES ('a1', 6, 9.4) is the standard SQL syntax for inserting new records into a table. This command appends the specified values as a new row to the existing Delta table.

2. Why other options are incorrect:

   • B: my_table UNION VALUES ('a1', 6, 9.4) - This is not valid SQL syntax for insertion. UNION is used to combine results of SELECT queries, not for inserting data.
   • C: INSERT VALUES ('a1', 6, 9.4) INTO my_table - This has incorrect syntax order. The correct order is INSERT INTO table_name VALUES (...).
   • D: UPDATE my_table VALUES ('a1', 6, 9.4) - UPDATE is used to modify existing records, not to insert new ones. UPDATE requires a SET clause and WHERE condition.
   • E: UPDATE VALUES ('a1', 6, 9.4) my_table - This has multiple syntax errors: incorrect UPDATE syntax and wrong order.

3. Additional context for Delta tables:

   • When working with Delta tables in Databricks, standard SQL INSERT statements work seamlessly.
   • The INSERT INTO syntax is the correct way to append new records to an existing Delta table.
   • The VALUES clause must match the column order and data types of the target table.

Note: The question assumes the table my_table has columns in the order: id, rank, rating, matching the data types specified in the record.