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Teradata SQL Flashcards

6 cards from real Teradata practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 Teradata SQL flashcards as text

  1. Which Teradata SQL clause is used to eliminate duplicate rows from a result set?

    Answer: DISTINCT

    The DISTINCT keyword in a SELECT statement removes duplicate rows from the query result set.

  2. What does the QUALIFY clause do in Teradata SQL?

    Answer: Filters rows based on window function results

    QUALIFY filters rows based on the result of an ordered analytical (window) function, similar to HAVING for aggregates.

  3. Which Teradata join type returns all rows from both tables, including unmatched rows from each side?

    Answer: FULL OUTER JOIN

    A FULL OUTER JOIN returns all rows from both tables, filling NULLs where there is no match on either side.

  4. In Teradata, what is the purpose of the SAMPLE clause?

    Answer: Returns a random subset of rows

    The SAMPLE clause retrieves a random sample of rows from a table, useful for testing or statistical analysis.

  5. Which aggregate function in Teradata returns the middle value of an ordered dataset?

    Answer: MEDIAN

    The MEDIAN function returns the middle value of a numeric column when the values are sorted in ascending order.

  6. What does the CAST function do in Teradata SQL?

    Answer: Converts a value from one data type to another

    CAST converts an expression or column value from one data type to another, such as converting VARCHAR to INTEGER.

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