MySQL user defined function with nested query inside - mysql

I want to create a mysql function to get due date (90 work days from start_date) based on my local holiday calendar. The query in my PHP function is like this..
select max(col_date) as due_date from (select col_date from ref_calendar where holiday=0 and col_date>'".$start_date."' limit 90) as a
I want to make it as a mysql function so I can just query "duedate(start_date)" to get the due date.
I have tried but still failed.
CREATE FUNCTION duedate(st_date DATE)
DECLARE datedue DATE
BEGIN
SELECT MAX(col_date) INTO datedue from (select col_date from ref_calendar where holiday=0 and col_date>st_date limit 90);
RETURN datedue;
END


Problem resolved. This is my final code after read MariaDB knowledge base.
CREATE OR REPLACE FUNCTION duedate (st_date DATE)
RETURNS DATE
RETURN (select max(a.col_date) FROM (select col_date from ref_calendar where holiday=0 and col_date>st_date limit 90) as a);
Thank you! :)

Related

Fetch values between two dates - MariaDB version: 10.1.37

I'm trying to fetch values between two dates, specifically 24hrs
SELECT *
FROM `transactions`
WHERE accnum = '1534610376'
AND tdate BETWEEN 20190311 AND 20190312
This query works fine but, i don't want it for a constant date, i have checked and seen many format but none seems to work. please help

If you "want records from today alone" - a simple way would be:
WHERE accnum = '1534610376'
AND DATE(tdate) = CURRENT_DATE()
However - To utilize an index, a column should not be wrapped into a function. So an efficient way would be
WHERE accnum = '1534610376'
AND tdate >= CURRENT_DATE()
AND tdate < CURRENT_DATE() + INTERVAL 1 DAY
A good index for this query would be INDEX(accnum, tdate).

I suggest you to put your date between quots like this:
SELECT *
FROM `transactions`
WHERE accnum = '1534610376'
AND tdate BETWEEN '20190311' AND '20190312'
After, you can define a user defined function like this :
CREATE FUNCTION BetweenDate(#toCompare VARCHAR(30), #rightDate DATE, #leftDate DATE)
RETURNS TABLE
AS
BEGIN
RETURN (
SELECT *
FROM transactions
WHERE accum = #toCompare AND tdate BETWEEN #rightDATE AND #leftDate
)
END;

MySQL - Return Row Where Current Date Between Start and End Date

I have searched everywhere and can't find an answer for this.
The table below shows the class start and end time.
I am looking to return the row where the current time falls in-between the current start and end time.
The start and End time are going to be variable dependent on current time, so can't input specific values.
An exmaple being, Say if the current time is:
2016-02-05 20:15:00
Then it would return the row where Class ID is 6.

You can use any of the below queries
SELECT *
FROM Table
WHERE NOW() BETWEEN Class_Start_Timestamp AND Class_End_Timestamp
OR
SELECT *
FROM Table
WHERE NOW() >= Class_Start_Timestamp AND NOW() <= Class_End_Timestamp

SELECT * FROM TABLE
WHERE Class_Start_Timestamp > GETDATE()
AND Class_End_Timestamp < GETDATE()
If the columns are not datetime:
SELECT * FROM TABLE
WHERE CAST(Class_Start_Timestamp AS datetime) > GETDATE()
AND CAST(Class_End_Timestamp AS datetime) < GETDATE()
You can also use "NOW()" (mysql) and "BETWEEN", but a quick google should have yielded many options...

Count mysql rows by hourly for given date

I have a mysql table with date column. date column data type is TIMESTAMP and default set to CURRENT_TIMESTAMP which record both date and time
now i want to count my rows under given day
As an example
++++++++++ 8am 9am 10am 11am
++user1+++ 15 10 11 10
++user2+++ 10 10 20 30
Every hour count should be recorded separately like this.
i tried with this but it's not working
SELECT COUNT(*) FROM mytable
WHERE `date` = '2015-01-26'
GROUP BY HOUR(`TIMESTAMP`)
how can i achieve this ?
i have no idea how to group with user . sproc is also okay
I made a sproc like this. but this sproc contain errors. can some one please help me now i want to count this separated by 9 hours
DELIMITER $$
CREATE DEFINER=`root`#`localhost` PROCEDURE `test22`(IN datestamp DATE)
BEGIN
SELECT username,
COUNT(if(disblid,1,null)) '8:00 AM', where time between '08:00' and '09:00':
COUNT(if(disblid,1,null)) '9:00 AM' , where time between '09:00' and '10:00';
FROM claimloans
WHERE DATE(date) = datestamp
group by Username;
END
Thanks for everyone who helped me I come up with sproc that working perfectly fine.
DELIMITER $$
CREATE DEFINER=`root`#`localhost` PROCEDURE `claimscounter`(IN datestamp DATE)
BEGIN
SELECT username,
COUNT(IF(HOUR(date)=0,1,NULL)) AS '12am',
COUNT(IF(HOUR(date)=1,1,NULL)) AS '1am',
COUNT(IF(HOUR(date)=2,1,NULL)) AS '2am',
COUNT(IF(HOUR(date)=3,1,NULL)) AS '3am',
COUNT(IF(HOUR(date)=4,1,NULL)) AS '4am',
COUNT(IF(HOUR(date)=5,1,NULL)) AS '5am',
COUNT(IF(HOUR(date)=6,1,NULL)) AS '6am',
COUNT(IF(HOUR(date)=7,1,NULL)) AS '7am',
COUNT(IF(HOUR(date)=8,1,NULL)) AS '8am',
COUNT(IF(HOUR(date)=9,1,NULL)) AS '9am',
COUNT(IF(HOUR(date)=10,1,NULL)) AS '10am',
COUNT(IF(HOUR(date)=11,1,NULL)) AS '11am',
COUNT(IF(HOUR(date)=12,1,NULL)) AS '12pm',
COUNT(IF(HOUR(date)=13,1,NULL)) AS '1pm',
COUNT(IF(HOUR(date)=14,1,NULL)) AS '2pm',
COUNT(IF(HOUR(date)=15,1,NULL)) AS '3pm',
COUNT(IF(HOUR(date)=16,1,NULL)) AS '4pm',
COUNT(IF(HOUR(date)=17,1,NULL)) AS '5pm',
COUNT(IF(HOUR(date)=18,1,NULL)) AS '6pm',
COUNT(IF(HOUR(date)=19,1,NULL)) AS '7pm',
COUNT(IF(HOUR(date)=20,1,NULL)) AS '8pm',
COUNT(IF(HOUR(date)=21,1,NULL)) AS '9pm',
COUNT(IF(HOUR(date)=22,1,NULL)) AS '10pm',
COUNT(IF(HOUR(date)=23,1,NULL)) AS '11pm'
FROM claimloans
WHERE DATE(date) = datestamp
group by username;
END
But now I have another small problem. This count all the hours. if it's not entry for some hour it count as zero. I want to count hours only have records can someone help me with this
thnaks

I would solve this as a view, like so:
CREATE TABLE foo (id int not null, val timestamp);
CREATE VIEW foo_by_hours AS (
SELECT
id,
DATE(val) AS 'day',
COUNT(IF(HOUR(val)=0,1,NULL)) AS '12am',
COUNT(IF(HOUR(val)=1,1,NULL)) AS '1am',
COUNT(IF(HOUR(val)=2,1,NULL)) AS '2am',
COUNT(IF(HOUR(val)=3,1,NULL)) AS '3am',
...
FROM foo
GROUP BY id, day);
SELECT * FROM foo_by_hours;
Full example on SQL Fiddle
I also added a view which uses SUM instead of COUNT. The result is the same, it's just a different way of doing it.

TSQL - Calculating datediff in a query and setting a value?

Using SQL Server 2008, I want to calculate the timespan, in seconds, that has occurred between two times.
The start date, is the timestamp of the last occurance of where a specific ID exists (if the filter is true), get the time from that timestamp record, and do a DATEDIFF() against the current processing time and return a value, #LastEventTimespan, in seconds.
DECLARE #CurrentProcessTime DATETIME
DECLARE #LastEventTimespan DATETIME
SET #CurrentProcessTime = GetDate()
-- find the timespan since the last session event
-- DATEDIFF ( datepart , startdate , enddate )
SELECT MAX(PageVisitEventID) AS LastPageVisitEventID, #LastEventTimespan = DATEDIFF(second , DateAdded , #CurrentProcessTime )
FROM PageVisitEvents
WHERE UserID = #UserID
GROUP BY LastPageVisitEventID
I figured I could get the MAX ID of the filter and process accordingly but am unable to set the #LastEventTimespan, however trying to assign a value when doing data-retrieval is a no-no.
How can I get around this?
Thanks.

I guess you want something like this.
DECLARE #LastEventTimespan INT
SELECT TOP 1 #LastEventTimespan = DATEDIFF(SECOND, DateAdded, GETDATE())
FROM PageVisitEvents
WHERE UserID = #UserID
ORDER BY PageVisitEventID DESC
This will calculate the difference in seconds between DateAdded for the highest value of PageVisitEventID for a given user and the current DateTime. I changed the data type of #LastEventTimespan to INT because it probably makes more sense when dealing with seconds.

You can replace the SELECT statement with this one:
SELECT TOP 1
#LastEventTimespan = DATEDIFF(second , DateAdded , #CurrentProcessTime )
FROM PageVisitEvents
WHERE UserID = #UserID
ORDER BY PageVisitEventID desc
I've done such queries many times and never had problems.

How can I return results less than current date?

I want to return results from my table that have a date less than today's date. Here is my statement:
$today = date('Y-m-d');
SELECT * FROM events WHERE STR_TO_DATE('$today', '%Y-%m-%d') > wp_eventscalendar_main.eventStartDate
I can select events in the future without a problem but when I try to select events in the past I don't get any results. My column 'eventStartDate' is set as a Date. Is there some kind of special operator I should be using for this?
Thanks,

You probably need:
SELECT * FROM events WHERE CURDATE() > wp_eventscalendar_main.eventStartDate
MySQL tries to compare a String to a Date, which won't work reliably.

You can Use
select from table_name where date < curdate()