这对你有用吗？
select * from purchaseorderswhere (case when IsNumeric(purchase_order_number) = 1 then cast(purchase_order_number as int) else 0 end) >= 7
这对你有用吗？
select * from purchaseorderswhere (case when IsNumeric(purchase_order_number) = 1 then cast(purchase_order_number as int) else 0 end) >= 7
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