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Developer-C 11.1
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create table t_test as select 1 as id, 1 as class, 'aaa' as tag union all select 2, 1, 'abb' as tag union all select 3, 1, 'acc' as tag union all select 4, 1, 'baa' as tag union all select 5, 2, 'bbb' as tag union all select 6, 2, 'aaa' as tag
select class, avg( tag like 'a%' ) as a_ratio from t_test group by class;
class
a_ratio
1
0.7500
2
0.5000