您要查找的是不是:
若要确定支付给所有雇员的金额总数,请使用COALESCE函数,它只接受在hourly_wage、salary和commission中找到的非空值。
To determine the total amount paid to all employees, use the COALESCE function to receive only the nonnull value found in hourly_wage, salary, and commission.
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