Rollup to Count # of fields that say "Yes"

[Nick_Burrus]

Can I use a Rollup to count the # of fields in a column that say “Yes” on a linked table?

[W_Vann_Hall]

If the field contains 'yes' or is blank, you can use a rollup with COUNTA(values) for the aggregation function.

If the field contains 'yes', 'no', 'maybe', and so on (that is, if you’re looking for yesses among a number of possible results), you’ll need to define a formula field with the formula

IF({Query Field]='Yes',1,0)

and then roll up the values of that field using SUM(values) as an aggregation function.