MySQL Date and Time Exercises: Get the distinct Mondays from hire_date in employees tables

MySQL Date Time: Exercise-3 with Solution

Write a MySQL query to get the distinct Mondays from hire_date in employees tables.

Sample table: employees

Code:

-- This SQL query retrieves distinct dates representing the first day of the week for each hire date in the 'employees' table.

SELECT DISTINCT( -- Selects distinct values of the result set.
    STR_TO_DATE( -- Converts a string into a date value.
CONCAT( -- Concatenates multiple strings into one string.
YEARWEEK(hire_date), -- Gets the year and week number for each hire date.
            '1' -- Appends '1' to the end of the concatenated string.
        ), 
        '%x%v%w' -- Specifies the format of the input string.
    )
) 
FROM 
employees; -- Specifies the 'employees' table.

Explanation:

• The YEARWEEK() function returns the year and week number for a given date.
• CONCAT() concatenates the year and week number with '1'.
• %x%v%w represents the format for the input string: %x for the year, %v for the week (ISO 8601 week), and %w for the day of the week.
• STR_TO_DATE() converts the concatenated string into a date value based on the specified format.
• The SELECT DISTINCT() statement ensures that only unique dates are returned.
• The query produces a distinct set of dates representing the first day of the week for each hire date in the 'employees' table.

Pictorial Presentation of the above query:

Sample Output:

(STR_TO_DATE
 (CONCAT(YEARWEEK(hire_date),'1'),'%x%v%w'))
1987-06-08T04:00:00.000Z
1987-06-15T04:00:00.000Z
1987-06-22T04:00:00.000Z
1987-06-29T04:00:00.000Z
1987-07-06T04:00:00.000Z
1987-07-13T04:00:00.000Z
1987-07-20T04:00:00.000Z
1987-07-27T04:00:00.000Z
1987-08-03T04:00:00.000Z
1987-08-10T04:00:00.000Z
1987-08-17T04:00:00.000Z
1987-08-24T04:00:00.000Z
1987-08-31T04:00:00.000Z
1987-09-07T04:00:00.000Z
1987-09-14T04:00:00.000Z
1987-09-21T04:00:00.000Z

MySQL Code Editor:

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