A.oncheck-pr B.oncheck-pe C.oncheck-pp D.oncheck-pt
A.使用set statistics io語(yǔ)句 B.使用set statistics time語(yǔ)句 C.使用set statistics CPU語(yǔ)句 D.使用set statistics time and CPU語(yǔ)句
A.delete from sales B.delete profits from sales where product_type=’TOYS’ C.delete from sales where product_type=’ToYS’ D.update sales set profits=null where product_type=’TOYS’