In my tool users can set their workdays (example: monday to friyday).When they save their settings, it will stored in the mysql user table.
In the next week (this week) i will get their "last workday". In this case it will be the friday. How can i get the last workday from every user with mysql?
Currently i save the workdays in csv (2,3,4,5,6 - 2 = Monday...) but i can change that.
I tried some stuff with WEEKDAY(), but it doesnt work.
Can anybody help me?
DAYNAME(CONCAT('1970-09-2', SUBSTRING_INDEX(workdays, ',', -1)))
Explanation:
This MySQL string function SUBSTRING_INDEX:
SUBSTRING_INDEX(workdays, ',', -1)
...will give you the number of the last workday listed. (What it does is find all the positions where there's a comma and returns everything after the last comma, e.g., SUBSTRING_INDEX('1,2,3', ',', -1) returns 3.)
And this trick from here, using DAYNAME and CONCAT:
DAYNAME(CONCAT('1970-09-2', dayIndex))
...gives you the day name. (Since DAYNAME requires a date, this technique picks a date in the past that is a Sunday and ends in 0, in this case 1970-09-20, and replaces the last digit with the returned index to determine the corresponding day of week, e.g., 20 = Sunday, 21 = Monday, etc.)
Put them together:
SELECT DAYNAME(CONCAT('1970-09-2', SUBSTRING_INDEX(workdays, ',', -1))) AS lastday FROM ...
...and you get the corresponding name of the weekday returned in the lastday variable.
Below sql query might give some help to you. Hope you are asking for this only. It will list the last working day (friday) for each user.
SELECT * FROM tablename
WHERE user_id, workday_id IN
(SELECT user_id, MAX(workday_id) FROM tablename GROUP BY user_id );
Related
I have a column(varchar) with date values, I need to find those dates which are expiring in next 30 days.
ExpiringDate
===================
20171208,
20171215,samples
20171130,tested
N/A
No
(empty row)
So, First I need to get values before comma. On the resultset, I need to filter out rows that has only numbers(no 'N/A' or 'No' or empty rows) & then I need to filter those dates which are expiring in next 30 days.
Edited
I have tried the following & resultset seems to be inappropriate
SELECT
DocName,
CategoryName,
AttributeName,
CAST(SUBSTRING_INDEX(AttributeValue, ',', 1) AS DATE) AS ExpiredDate
FROM myDB
WHERE (AttributeName = 'Date of last vessel OVID' OR AttributeName = 'Next Statutory docking' OR
AttributeName = 'Last statutory docking') AND AttributeValue LIKE '%[^0-9]%' AND
DATEDIFF(now(), AttributeValue) <= 30;
Because you are not only storing dates as text, but mixing those dates with entirely non date information, this complicates things. In this case, we can do two checks, one to ensure that the record starts with an actual expected date, and the second to make sure that the date diff is within 30 days from now.
SELECT ExpiringDate
FROM
(
SELECT ExpiringDate
FROM yourTable
WHERE ExpiringDate REGEXP '^[0-9]{8}'
) t
WHERE
DATEDIFF(LEFT(ExpiringDate, 8), NOW()) BETWEEN 0 AND 30;
Note that I use a subquery to first remove rows that do not even have a parseable date. The reason for this is that DATEDIFF will error out if not passed valid dates for both parameters.
Demo
I am using the Graph Reports for the select below. The MySQL database only has the active records in the database, so if no records are in the database from X hours till Y hours that select does not return anything. So in my case, I need that select return Paypal zero values as well even the no activity was in the database. And I do not understand how to use the UNION function or re-create select in order to get the zero values if nothing was recorded in the database in time interval. Could you please help?
select STR_TO_DATE ( DATE_FORMAT(`acctstarttime`,'%y-%m-%d %H'),'%y-%m-%d %H')
as '#date', count(*) as `Active Paid Accounts`
from radacct_history where `paymentmethod` = 'PayPal'
group by DATE_FORMAT(`#date`,'%y-%m-%d %H')
When I run the select the output is:
Current Output
But I need if there are no values between 2016-07-27 07:00:00 and 2016-07-28 11:00:00, then in every hour it should show zero active accounts Like that:
Needed output with no values every hour
I have created such select below , but it not put to every hour the zero value like i need. showing the big gap between the 12 Sep and 13 Sep anyway, but there should be the zero values every hour
(select STR_TO_DATE ( DATE_FORMAT(acctstarttime,'%y-%m-%d %H'),'%y-%m-%d %H')
as '#date', count(paymentmethod) as Active Paid Accounts
from radacct_history where paymentmethod <> 'PayPal'
group by DATE_FORMAT(#date,'%y-%m-%d %H'))
union ALL
(select STR_TO_DATE ( DATE_FORMAT(acctstarttime,'%y-%m-%d %H'),'%y-%m-%d %H')
as '#date', 0 as Active Paid Accounts
from radacct_history where paymentmethod <> 'PayPal'
group by DATE_FORMAT(#date,'%y-%m-%d %H')) ;
I guess, you want to return 0 if there is no matching rows in MySQL. Here is an example:
(SELECT Col1,Col2,Col3 FROM ExampleTable WHERE ID='1234')
UNION (SELECT 'Def Val' AS Col1,'none' AS Col2,'' AS Col3) LIMIT 1;
Updated the post: You are trying to retrieve data that aren't present in the table, I guess in reference to the output provided. So in this case, you have to maintain a date table to show the date that aren't in the table. Please refer to this and it's little bit tricky - SQL query that returns all dates not used in a table
You need an artificial table with all necessary time intervals. E.g. if you need daily data create a table and add all day dates e.g. start from 1970 till 2100.
Then you can use the table and LEFT JOIN your radacct_history. So for each desired interval you will have group item (group by should be based on the intervals table.
I have a mysql table which stores users' availability, stored in 'start' and 'end' columns as date fields.
I have a form where other users can search through the 'availabilty' with various periods like, today, tomorrow and next week . I'm trying to figure out how to construct the query to get all the rows for users who are available 'next month'.
The 'start' values maybe from today and the 'end' value might might be three months away but if next month falls between 'start' and 'end' then I would want that row returned.
The nearest I can get is with the query below but that just returns rows where 'start' falls within next month. Many thanks,
sql= "SELECT * FROM mytable WHERE start BETWEEN DATE_SUB(LAST_DAY(DATE_ADD(NOW(), INTERVAL 1 MONTH)),INTERVAL DAY(LAST_DAY(DATE_ADD(NOW(), INTERVAL 1 MONTH)))-1 DAY) AND LAST_DAY(DATE_ADD(NOW(), INTERVAL 1 MONTH))";
As you are interested in anything that happens in the full month following the current date you could try something like this:
SELECT * FROM mytable WHERE
FLOOR(start/100000000)<=FLOOR(NOW()/100000000)+1 AND
FLOOR( end/100000000)>=FLOOR(NOW()/100000000)+1
This query make use of the fact that datetime values are stored in MySql internally as a number like
SELECT now()+0
--> 20150906130640
where the digits 09 refer to the current month. FLOOR(NOW()/100000000) filters out the first digits of the number (in this case:201509). The WHERE conditions now simply test whether the start date is anywhere before the end of the next month and the end date is at least in or after the period of the next month.
(In my version I purposely left out the condition that start needs to be "after today", since a period that has started earlier seems in my eyes still applicable for your described purpose. If, however, you wanted that condition included too you could simply add an AND start > now() at the end of your WHERE clause.)
Edit
As your SQLfiddle is set-up with a date instead of a (as I was assuming) datetime column your dates will be represented differently in mumeric format like 20150907 and a simple division by 100 will now get you the desired month-number for comparison (201509):
SELECT * FROM mytable WHERE
FLOOR(start/100)<=FLOOR(NOW()/100000000)+1 AND
FLOOR( end/100)>=FLOOR(NOW()/100000000)+1
The number returned by NOW() is still a 14-digit figure and needs to be divided by 100000000. See your updated fiddle here: SQLfiddle
I also added another record ('Charlie') which does not fulfill your requirements.
Update
To better accommodate change-of-year scenarios I updated my SqlFiddle. The where clause is now based on 12*YEAR(..)+MONTH(..) type functions.
I have attendance data for employees stored in the table attendance with the following column names:
emp_id (employee ID)
date
type (leave, absent, etc.)
(there are others but I'm omitting them for the sake of simplicity)
My objective is to retrieve all dates of the given month on which the employee was on leave (type = 'Leave') and the last leave taken in the last month, if any.
It's easy to do it using two queries (I'm using PHP to get process the data), but is there any way this can be done in a single query?
I'm answering my own question so as to close it. As #bpgergo pointed out in the comments, UNION will do the trick here.
SELECT * FROM table_name
WHERE type="Leave" AND
date <= (CURRENT_DATE() - 30)
Select the fields, etc you want then se a combined where clause using mysql's CURRENT_DATE() function. I subtracted 30 for 30 days in a month.
If date is a date column, this will return everyone who left 1 month or longer ago.
Edit:
If you want a specific date, change the 2nd month like this:
date <= (date_number - 30)
I have a Mysql Table that holds dates that are booked (for certain holiday properties).
Example...
Table "listing_availability"
Rows...
availability_date (this shows the date format 2013-04-20 etc)
availability_bookable (This can be yes/no. "Yes" = the booking changeover day and it is "available". "No" means the property is booked for those dates)
All the other dates in the year (apart from the ones with "No") are available to be booked. These dates are not in the database, only the booked dates.
My question is...
I have to make a SQL Statement that first calls the Get Date Function (not sure if this is correct terminology)
Then removes the dates from "availability_date" WHERE "availability_bookable" = "No"
This will give me the dates that are available for bookings, for the year, for a property.
Can anyone help?
Regards M
Seems like you've almost written the query.
SELECT availability_date FROM listing_availability
WHERE availability_bookable <> 'NO'
AND availability_date >= CURDATE()
AND YEAR(CURDATE()) = YEAR(availability_date)
I think I understand, and you'll obviously confirm. Your "availability_booking" has some records in it, but not every single day of the year, only those that may have had something, and not all are committed, some could have yes, some no.
So, you want to simulate All dates within a given date range... Say April 1 - July 1 as someone is looking to book a party within that time period. Instead of pre-filling your production table, you can't say that April 27th is open and available... since no such record exists.
To SIMULATE a calendar of days for a date range, you can do it using MySQL variables and join to "any" table in your database provided it has enough records to SIMULATE the date range you want...
select
#myDate := DATE_ADD( #myDate, INTERVAL 1 DAY ) as DatesForAvailabilityCheck
from
( select #myDate := '2013-03-31' ) as SQLVars,
AnyTableThatHasEnoughRows
limit
120;
This will just give you a list of dates starting with April 1, 2013 (the original #myDate is 1 day before the start date since the field selection adds 1 day to it to get to April 1, then continues... for a limit of 120 days (or whatever you are looking for range based -- 30days, 60, 90, 22, whatever). The "AnyTableThatHasEnoughRows" could actually be your "availability_booking" table, but we are just using it as a table with rows, no join or where condition, just enough to get ... 120 records.
Now, we can use this to join to whatever table you want and apply your condition. You just created a full calendar of days to compare against. Your final query may be different, but this should get it most of the way for you.
select
JustDates.DatesForAvailabilityCheck,
from
( select
#myDate := DATE_ADD( #myDate, INTERVAL 1 DAY ) as DatesForAvailabilityCheck
from
( select #myDate := '2013-03-31' ) as SQLVars,
listing_availability
limit
120 ) JustDates
LEFT JOIN availability_bookable
on JustDates.DatesForAvailabilityCheck = availability_bookable.availability_date
where
availability_bookable.availability_date IS NULL
OR availability_bookable.availability_bookable = "Yes"
So the above uses the sample calendar and looks to the availability. If no such matching date exists (via the IS NULL), then you want it meaning there is no conflict. However, if there IS a record in the table, you only want those where YES, you CAN book it, the entry on file might not be committed and CAN be in your result query of available dates.