how do I get month from date in mysql

问题

I want to be able to fetch results from mysql with a statement like this:

SELECT * 
  FROM table 
 WHERE amount > 1000

But I want to fetch the result constrained to a certain a month and year (based on input from user)... I was trying like this:

SELECT * 
  FROM table 
 WHERE amount > 1000 
   AND dateStart = MONTH('$m')

...$m being a month but it gave error.

In that table, it actually have two dates: startDate and endDate but I am focusing on startDate. The input values would be month and year. How do I phrase the SQL statement that gets the results based on that month of that year?

回答1:

You were close - got the comparison backwards (assuming startDate is a DATETIME or TIMESTAMP data type):

SELECT * 
  FROM table 
 WHERE amount > 1000 
   AND MONTH(dateStart) = {$m}

Caveats:

Mind that you are using mysql_escape_string or you risk SQL injection attacks.
Function calls on columns means that an index, if one exists, can not be used

Alternatives:

Because using functions on columns can't use indexes, a better approach would be to use BETWEEN and the STR_TO_DATE functions:

WHERE startdate BETWEEN STR_TO_DATE([start_date], [format]) 
                    AND STR_TO_DATE([end_date], [format])

See the documentation for formatting syntax.

Reference:

MONTH
YEAR
BETWEEN
STR_TO_DATE

回答2:

Use the month() function.

select month(now());

回答3:

Try this:

SELECT * 
FROM table 
WHERE amount > 1000 AND MONTH(dateStart) = MONTH('$m') AND YEAR(dateStart) = YEAR('$m')

回答4:

E.g.

$date = sprintf("'%04d-%02d-01'", $year, $month);
$query = "
  SELECT
    x,y,dateStart
  FROM
    tablename
  WHERE
    AND amount > 1000
    AND dateStart >= $date
    AND dateStart < $date+Interval 1 month
";
mysql_query($query, ...

This will create a query like e.g.

WHERE
  AND amount > 1000
  AND dateStart >= '2010-01-01'
  AND dateStart < '2010-01-01'+Interval 1 month

+ Interval 1 month is an alternative to date_add().

SELECT Date('2010-01-01'+Interval 1 month)-> 2010-02-01
SELECT Date('2010-12-01'+Interval 1 month)-> 2011-01-01
This way you always get the first day of the following month. The records you want must have a dateStart before that date but after/equal to the first day of the month (and year) you've passed to sprintf().
'2010-01-01'+Interval 1 month doesn't change between rows. MySQL will calculate the term only once and can utilize indices for the search.

回答5:

Try this

SELECT * 
      FROM table 
     WHERE amount > 1000 
       AND MONTH(datestart)
    GROUP BY EXTRACT(YEAR_MONTH FROM datestart)

回答6:

Try this if(date field is text then convert this string to date):

SELECT * FROM `table_name` WHERE MONTH(STR_TO_DATE(date,'%d/%m/%Y'))='11'

//This will give month number MONTH(STR_TO_DATE(date,'%d/%m/%Y'))
//If its return 11 then its November
// Change date format with your date string format  %d/%m/%Y

回答7:

Works in: MySQL 5.7, MySQL 5.6, MySQL 5.5, MySQL 5.1, MySQL 5.0, MySQL 4.1, MySQL 4.0, MySQL 3.23

Day:
```
SELECT EXTRACT(DAY FROM "2017-06-15");
```

Month:

SELECT EXTRACT(MONTH FROM "2017-06-15");

Year:

SELECT EXTRACT(YEAR FROM "2017-06-15");

来源：https://stackoverflow.com/questions/2039839/how-do-i-get-month-from-date-in-mysql

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