q
Execute SQL-like queries on .csv and .tsv files.
- Query `.csv` file by specifying the delimiter as ',':
q -d',' "SELECT * from {path/to/file}"
q -t "SELECT * from {path/to/file}"
- Query file with header row:
q -d{delimiter} -H "SELECT * from {path/to/file}"
- Read data from stdin; '-' in the query represents the data from stdin:
{output} | q "select * from -"
- Join two files (aliased as `f1` and `f2` in the example) on column `c1`, a common column:
q "SELECT * FROM {path/to/file} f1 JOIN {path/to/other_file} f2 ON (f1.c1 = f2.c1)"
- Format output using an output delimiter with an output header line (note: command will output column names based on the input file header or the column aliases overridden in the query):
q -D{delimiter} -O "SELECT {column} as {alias} from {path/to/file}"
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