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Ph='025' substring(Ph,1,3)='025' substring(Ph,1,2,3)='025' Ph like'025*'
Ph='025' substring(Ph,1,3)='025' substring(Ph,1,2,3)='025' Ph like'025*'
(﹣∞,﹣2)∪(2,+∞) (2,3) (2,3) (2,4)
2 -2 -
Ph=’025’ substring(Ph,1,3)=’025’ substring(Ph,1,2,3)=’025’ Ph like’025*’
0. 015~0. 025 1. 015~1. 025 1. 001~1. 002 5~7 1. 5~2. 5
±0、02%、±1′ ±0、025%、±1、5′ ±0、025%、±2′ ±0、05%、±1′