• Judging whether a field is a number in Oracle


    In our normal development, we may encounter the problem of judging whether a column is composed of numbers. We all know that Oracle does not provide us with such a ready-made function. According to my experience, I have summed up two effective methods (column name: column, table name: table) Use the translate + 1 Copy […]

  • Opening Trim Instruction for SSD Solid-State Hard Disk on MacOS


    Solid-state hard disk (SSD) breaks through the speed bottleneck of traditional hard disk, and works stably, without noise and consumes less power. With the decrease of cost, SSD will replace traditional hard disk greatly. Most people who use SSD have heard of TRIM. Operating system must support TRIM to optimize the performance of SSD. So […]