Tableau CRM SAQL Reference

Overview
Quick Start
Examples
SAQL Reference
SAQL Basic Elements
SAQL Operators
SAQL Statements
SAQL Functions
Aggregate Functions
avg() or average()
count()
first()
last()
max()
median()
min()
sum()
unique()
stddev()
stddevp()
var()
varp()
percentile_cont()
percentile_disc()
regr_intercept()
regr_slope()
regr_r2()
grouping()
Date Functions
Time Zone Date Functions (Beta)
Work with Custom Fiscal Year Data
String Functions
Math Functions
Windowing Functions
coalesce
Query Performance
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count()

Returns the number of rows that match the query criteria.
For example, to calculate the number of carriers:
1q = foreach q generate 'carrier' as 'carrier', count() as 'count';
count() operates on the stream that is input to the group or cogroup statement. It doesn’t operate on the newly grouped stream or on an ungrouped stream. 
1q = load "Carriers";
2q = group q by (Year);
3q = foreach a1 generate count(q) as countYear, count() as count, Year as year;