assert_pk: Assert the data.table has a primary key
In shrektan/dtkit: Utility functions for data.table
Description
Usage
Arguments
Details
Description
The primary key here is similar to the concept in relational DB.
It means the key uniquely identifies each record in the table. It's an important
attribute when x is an information table, which is later quried / merged against
by other tables. A primary-keyed table can avoid duplicates in such cases.
Usage
1
assert_pk(x)
Arguments
x
a data.table object
Details
Throws error unless x has a key, contains no NA values in key columns,
and is unique for key values.
shrektan/dtkit documentation built on Nov. 26, 2021, 10:50 p.m.
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Description Usage Arguments Details
Description
The primary key here is similar to the concept in relational DB.
It means the key uniquely identifies each record in the table. It's an important
attribute when x is an information table, which is later quried / merged against
by other tables. A primary-keyed table can avoid duplicates in such cases.
Usage
1 | assert_pk(x)
|
Arguments
x |
a |
Details
Throws error unless x has a key, contains no NA values in key columns,
and is unique for key values.
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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