Data Types

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  1. If an integer column is used for the values in range 1 to 99999, the best suitable datatype is ____________.










  1. View Hint View Answer Discuss in Forum

    NA

    Correct Option: D

    Since the range starts from the positive value 1, it is best to keep the datatype as UNSIGNED. The maximum value is of the order of 10^5, so a MEDIUMINT datatype is well suited.

  1. Which of these values is not valid as an AUTO_INCREMENT value?










  1. View Hint View Answer Discuss in Forum

    NA

    Correct Option: D

    In MySQL, the ‘AUTO_INCREMENT’ values are a sequence of unique values assigned to the columns such that they increase monotonically. They begin with the value 1 and increment by a unit.

  1. AUTO_INCREMENT columns must be NOT NULL.










  1. View Hint View Answer Discuss in Forum

    NA

    Correct Option: B

    The ‘AUTO_INCREMENT’ columns must be NOT NULL. If the NOT NULL is omitted, MySQL adds it automatically. AUTO_INCREMENT column values begin with 1 and increase monotonically after it.

  1. Which of these types store the longest length of strings?










  1. View Hint View Answer Discuss in Forum

    NA

    Correct Option: C

    In MySQL, the different string datatypes are used to store different lenghts of the string. Here, the length would refer to the number of characters in the string. TEXT stores longer strings.

  1. If a column is expected to store values up to 2 million, the best datatype for it is _____________.










  1. View Hint View Answer Discuss in Forum

    NA

    Correct Option: A

    The different numeric types used in MySQL are used to store different range of values. To store values of the order of a million, the MEDIUMINT or BIGINT datatype is sufficient.