FROM and SHOW. FROM names the dataset the report reads from, such as sales, inventory, or returns. SHOW lists the metrics you want to see, separated by commas.
Combining datasets
You can combine two datasets with+ when you want metrics from both in one report, for example sales alongside current stock. The first dataset sets the grain and the second is joined onto it.
Renaming a column
AddAS "Label" after a metric to give its column a custom heading. The label is shown wherever the column appears, including exports.
Computed columns
SHOW also accepts computed columns built from metrics and numbers using +, -, *, and /. Multiplication and division bind tighter than addition and subtraction, and parentheses group. Division guards against divide-by-zero. Computed columns follow the plain metrics and usually carry an AS label.

