how to structure availability relationships
I am building a recruitment database and need to structure 'current availability' data against candidates which can be one of three options - available now, a specific date (e.g. 5/3/2019) or a relative date (e.g. 4 weeks). When querying the database in my application the relative date will be calculated on the fly.
I am trying to work out the best way to store this data in a relational database. In my project I am using MySQL 5.7. I have tested and can see that storing this as JSON is possible e.g. the availability field in candidates table can be JSON with the following
{
'immediate': true
}
or
{
'relative': {
'period': '4',
'unit': 'Weeks'
}
}
or
{
'date': '2019-03-05'
}
the query can be something like this
select `candidates`.*,
CASE
WHEN availability->>'$.immediate' = 'true' THEN date(now())
WHEN availability->>'$.date' THEN date(availability->>'$.date')
WHEN availability->>'$.relative.unit' = 'week' THEN date(DATE_ADD(now(), INTERVAL availability->>'$.relative.period' WEEK))
WHEN availability->>'$.relative.unit' = 'month' THEN date(DATE_ADD(now(), INTERVAL availability->>'$.relative.period' MONTH))
END as available from `candidates`
order by `available` desc
Although this works I am adverse to using JSON in a relational database so wondering how the same result could be achieved in other more relational ways.
mysql database-design
asked 4 mins ago
the-a-trainthe-a-train
1063
add a comment |
I am building a recruitment database and need to structure 'current availability' data against candidates which can be one of three options - available now, a specific date (e.g. 5/3/2019) or a relative date (e.g. 4 weeks). When querying the database in my application the relative date will be calculated on the fly.
I am trying to work out the best way to store this data in a relational database. In my project I am using MySQL 5.7. I have tested and can see that storing this as JSON is possible e.g. the availability field in candidates table can be JSON with the following
{
'immediate': true
}
or
{
'relative': {
'period': '4',
'unit': 'Weeks'
}
}
or
{
'date': '2019-03-05'
}
the query can be something like this
select `candidates`.*,
CASE
WHEN availability->>'$.immediate' = 'true' THEN date(now())
WHEN availability->>'$.date' THEN date(availability->>'$.date')
WHEN availability->>'$.relative.unit' = 'week' THEN date(DATE_ADD(now(), INTERVAL availability->>'$.relative.period' WEEK))
WHEN availability->>'$.relative.unit' = 'month' THEN date(DATE_ADD(now(), INTERVAL availability->>'$.relative.period' MONTH))
END as available from `candidates`
order by `available` desc
Although this works I am adverse to using JSON in a relational database so wondering how the same result could be achieved in other more relational ways.
mysql database-design
asked 4 mins ago
the-a-trainthe-a-train
1063
add a comment |
I am building a recruitment database and need to structure 'current availability' data against candidates which can be one of three options - available now, a specific date (e.g. 5/3/2019) or a relative date (e.g. 4 weeks). When querying the database in my application the relative date will be calculated on the fly.
I am trying to work out the best way to store this data in a relational database. In my project I am using MySQL 5.7. I have tested and can see that storing this as JSON is possible e.g. the availability field in candidates table can be JSON with the following
{
'immediate': true
}
or
{
'relative': {
'period': '4',
'unit': 'Weeks'
}
}
or
{
'date': '2019-03-05'
}
the query can be something like this
select `candidates`.*,
CASE
WHEN availability->>'$.immediate' = 'true' THEN date(now())
WHEN availability->>'$.date' THEN date(availability->>'$.date')
WHEN availability->>'$.relative.unit' = 'week' THEN date(DATE_ADD(now(), INTERVAL availability->>'$.relative.period' WEEK))
WHEN availability->>'$.relative.unit' = 'month' THEN date(DATE_ADD(now(), INTERVAL availability->>'$.relative.period' MONTH))
END as available from `candidates`
order by `available` desc
Although this works I am adverse to using JSON in a relational database so wondering how the same result could be achieved in other more relational ways.
mysql database-design
asked 4 mins ago
the-a-trainthe-a-train
1063
I am building a recruitment database and need to structure 'current availability' data against candidates which can be one of three options - available now, a specific date (e.g. 5/3/2019) or a relative date (e.g. 4 weeks). When querying the database in my application the relative date will be calculated on the fly.
I am trying to work out the best way to store this data in a relational database. In my project I am using MySQL 5.7. I have tested and can see that storing this as JSON is possible e.g. the availability field in candidates table can be JSON with the following
{
'immediate': true
}
or
{
'relative': {
'period': '4',
'unit': 'Weeks'
}
}
or
{
'date': '2019-03-05'
}
the query can be something like this
select `candidates`.*,
CASE
WHEN availability->>'$.immediate' = 'true' THEN date(now())
WHEN availability->>'$.date' THEN date(availability->>'$.date')
WHEN availability->>'$.relative.unit' = 'week' THEN date(DATE_ADD(now(), INTERVAL availability->>'$.relative.period' WEEK))
WHEN availability->>'$.relative.unit' = 'month' THEN date(DATE_ADD(now(), INTERVAL availability->>'$.relative.period' MONTH))
END as available from `candidates`
order by `available` desc
Although this works I am adverse to using JSON in a relational database so wondering how the same result could be achieved in other more relational ways.
mysql database-design
mysql database-design
asked 4 mins ago
the-a-trainthe-a-train
1063
asked 4 mins ago
the-a-trainthe-a-train
1063
asked 4 mins ago
the-a-trainthe-a-train
1063
asked 4 mins ago
the-a-trainthe-a-train
1063
asked 4 mins ago
the-a-trainthe-a-train
1063
1063
add a comment |
add a comment |
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