How To Generate GUID In Databases - A brief explanation wtih sample statements - Covers MSSQL, DB2 and ORACLE-How To Generate GUID In Databases- A brief explanation wtih sample statements- Covers MSSQL, DB2 and ORACLE

城市三级分类脚本，使用GUID为主键，显示层级关系-City three level classification scr ipt, use GUID as the primary key, display hierarchy