select Name,
count(*) as CountAll,
count(case when Text like 'a1-%' or Text like 'a2-%' or Text like 'a3-%' then 1 end) as CountA1A2A3
from MyTable
group by Name
如果愿意，也可以使用RegEx。
SQL查询以特定条件分组
SQL查询以特定条件分组
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