I have a 'services' table having a column called 'duration'. Its datatype is time and data stored in this column like '00:30:00'
I also have another table for bookings having two columns 'start_time' and 'end_time'. Both columns datatype are also 'time'. I want to get summation of service->duration + booking->start_time and store it in the 'end_time' column. How can I add these two time data?
I tried something like this:
date('H:i:s', strtotime($booking_service->start_time) + strtotime($service->duration))
but it considers timezone offset and returns wrong result. How should I remove timezone offset? is there another better way such as using Laravel Carbon to sum these two times?
Related
I have Table 1. It is filled with dates a inspection is going on. Plumbing or Garden inspections for example.
Table 2 links to these appointments and has additional columns with details such as a Person assigned to the inspection, and what property the inspection is at. I need these two tables to be separate as described, and they are linked by a simple ID column.
Is it possible at all to add a column to Table 2 called 'Last Date of Plumbing Inspection'. The idea is for any given Property in Table 2, there can be multiple inspection entries in Table 1 for it. The point of this column is that it should look in Table 1, find the matching ID, find the latest inspection date out of all the Plumbing-related inspections, and then set the column value to that.
The problem I am having with this is it seems like calculated columns can ONLY implement logic using the columns of the table the calculated column was created in. In Table 2, I can't create a calculated column that interacts with Table 1 at all. I could create a look up column, but I can't combine calculated columns with look up columns. Is there a way to build this latest inspection date column without too much complexity?
Actually you can create a Rollup field and put a MAX aggregate function for achieving your requirement from related table. Read more
I have a recordset where rows have a date field.Rows are from current year and last year. I want to see the count of rows per year. That's easy. Now I'd like to have a third column with difference (count(currentYear) - count(lastYear)). Is there any way to achieve this?
thanks
It seems like you want to have the difference calculated between two members of the same date field.
If so, you might want to consider the customizeCell() API call to retrieve the count values of each year, use them to calculate the difference, and modify the necessary cells with the result.
Alternatively, you could try modifying your data set so that the lastYear and currentYear are two different fields – this, for example, would allow you to compare them within a calculated value.
I have column family with generated columns and heavy data in it.
Every column has name like PREFIX + TIMESTAMP.
I need to extract timestamp from column name before than I make a decision whether I need to get data from it.
How can I get only names of columns in CF?
I want to build sync method, both from my local database to parse.com and from parse.com to my local database. For first case ( from local to parse.com, Alhamdulillah my script run well. But for second case, i need query between column last_update and last_sync (i do not use updatedAt caused by i can't control it, so i use last_update).
Please explain me how to get all data if last_update is greaterThan last_sync?
From https://www.parse.com/questions/querying-between-two-dates i got query between two dates, but it's from same column, the value of query is real value. But my case, the value of key = last_update is column name, last_sync.
Thank you...
You can't use a query constraint that compares two columns. You need to change your logic. Why do you store both a last_update and last_sync in a record?
Syncing is a complex subject and you can easily mess up the logic. I don't understand how you can store a last_sync date on every record, as this has to be different for every user. You need to store the last_sync value for each user, and use that to compare against the last_update column on all records.
I have an object that is generated from XSDs, so I can't change it. In it I have a String DATE and a String TIME (representing the time of day without the date).
DATE = yyyy-mm-dd
TIME = hh:MM:ss:mmmm
In the OracleDB, I don't want to represent these as VARCHAR. I'd like to use DATE or DATETIME. Therefore, I'd need to map both DATE + TIME to one single column, DATETIME.
This is not possible. You can map two columns to a single property (using composites or user types) but not the other way around.
Using the same column name twice in the mapping file usually results in strange exceptions (index out of bounds).
I would use two columns in the database. Convert them to DATE-kind data types using a user type.