getColumn() function
The getColumn() function extracts a column from a table given its label.
If the label is not present in the set of columns, the function errors.
getColumn(column: "_value")
Use tableFind() to extract a single table
getColumn() requires a single table as input.
Use tableFind()
to extract a single table from a stream of tables.
Parameters
column
Name of the column to extract.
table
Input table.
Default is piped-forward data (<-).
Example
The following example uses data provided by the sampledata package
to show how getColumn() transforms data.
import "sampledata"
sampledata.int()
|> tableFind(fn: (key) => key.tag == "t1")
|> getColumn(column: "_value")
// Returns [-2, 10, 7, 17, 15, 4]
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