Update cheatsheets

q

@@ -0,0 +1,33 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# q
+
+> Execute SQL-like queries on .csv and .tsv files.
+> More information: <https://harelba.github.io/q>.
+
+- Query `.csv` file by specifying the delimiter as ',':
+
+`q -d',' "SELECT * from {{path/to/file}}"`
+
+- Query `.tsv` 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}}"`