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Functions
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- [a:b]
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- A()
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- [a1,...an]
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- E()
- E()
- elapse()
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- end s
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- month()
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- o()
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- ones()
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- pi()
- pivot()
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- polyfit()
- pos()
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- prior()
- proc()
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- Qconnect()
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- r.(x,...)
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- tan()
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- Intersection of sequences
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prior()
Here’s how to use prior() function.
r. prior()
Description：
Among the records, query fields referred by the foreign key recursively.
Syntax:
r.prior(F,r',n)
Note：
The function recursively queries field F referred by the foreign key, like [r,r. F, r. F. F,…] in record r. The query will not stop until the value of field F is equal to r'. When r is equal to r' , then return [].The default value of r' is NULL. The recursive query will be performed through all the records to the end. If the specified record r' does not exist, then return NULL. n is the maximum recursion depth, its value is 1,000 by default.
Parameter：
|
r |
Records |
|
F |
Field name |
|
r' |
A record |
|
n |
A Number |
Return value：
Sequence
Example：
|
|
A |
|
|
1 |
=file("D://emp.txt").import@t().keys(empid) |
|
|
2 |
>A1.switch(mgrid,A1:empid) |
|
|
3 |
=A1.select@1(name=="Kitty").prior(mgrid) |
Based on mgrid field referred by the foreign key, select all records of people who are superior to Kitty. |
|
4 |
=A1.select@1(name=="Kitty").prior(mgrid,A1.select@1(name=="Tiger"),5) |
Judge if Tiger is superior to Kitty and list all records of people superior to Barnes but inferior to Tiger. |
