How do I exclude weekends in SQL?

问题

I have a date column SLA_Date in the Orders table.

My SLA_Date should exclude weekends (Saturday & Sunday). Data for weekdays should be shown alone.

How do I do that in SQL?

回答1:

You just need to add the following filter:

WHERE TO_CHAR(date_column, 'DY','NLS_DATE_LANGUAGE=AMERICAN') NOT IN ('SAT', 'SUN')

Your query would look like:

SELECT SLA_Date
   FROM orders
 WHERE TO_CHAR(SLA_Date, 'DY','NLS_DATE_LANGUAGE=AMERICAN') NOT IN ('SAT', 'SUN')

For example(the WITH clause is only to build a test case), the below query is to display only the weekdays(i.e. excluding the Sat and Sun) ranging from 1st May 2015 to 31st May 2015:

SQL> WITH DATA AS
  2    (SELECT to_date('05/01/2015', 'MM/DD/YYYY') date1,
  3      to_date('05/31/2015', 'MM/DD/YYYY') date2
  4    FROM dual
  5    )
  6  SELECT date1+LEVEL-1 the_date,
  7        TO_CHAR(date1+LEVEL-1, 'DY','NLS_DATE_LANGUAGE=AMERICAN') day
  8  FROM DATA
  9  WHERE TO_CHAR(date1+LEVEL-1, 'DY','NLS_DATE_LANGUAGE=AMERICAN')
 10        NOT IN ('SAT', 'SUN')
 11  CONNECT BY LEVEL <= date2-date1+1;

THE_DATE  DAY
--------- ---
01-MAY-15 FRI
04-MAY-15 MON
05-MAY-15 TUE
06-MAY-15 WED
07-MAY-15 THU
08-MAY-15 FRI
11-MAY-15 MON
12-MAY-15 TUE
13-MAY-15 WED
14-MAY-15 THU
15-MAY-15 FRI
18-MAY-15 MON
19-MAY-15 TUE
20-MAY-15 WED
21-MAY-15 THU
22-MAY-15 FRI
25-MAY-15 MON
26-MAY-15 TUE
27-MAY-15 WED
28-MAY-15 THU
29-MAY-15 FRI

21 rows selected.

SQL>

For a detailed example, see Generate Date, Month Name, Week Number, Day number between two dates

回答2:

You can try the following condition to filter your data:

WHERE case to_char (SLA_Date, 'FmDay', 'nls_date_language=english') <> 'Saturday'
  AND case to_char (SLA_Date, 'FmDay', 'nls_date_language=english') <> 'Sunday'

回答3:

select *
from   orders
where  TRUNC (thing) - TRUNC (thing, 'IW') between 0 and 4;

http://sqlfiddle.com/#!4/db891/1

来源：https://stackoverflow.com/questions/30617282/how-do-i-exclude-weekends-in-sql

标签

sql

Oracle

datetime

date-arithmetic