How Many Cardiology Wards
The chief physician wants a quick stat: how many cardiology wards the hospital has. All of their codes start with the CARD prefix — count the number of distinct such wards.
Name the result column wards_count.
Expected output sample
This is what a correct answer looks like — its row count is its own, it doesn't have to match the schema tables.
| wards_count |
|---|
| 3 |
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