文件名称：非等值连接-复杂查询技术-连接
文件大小：671KB
文件格式：PPT
更新时间：2024-05-15 15:58:10
sql
非等值连接 EMPLOYEES JOB_GRADES … * 在EMPLOYEES 表中的工 资必须在JOB_GRADES 表 中的最低工资和最高工资之间 Non-Equijoins A non-equijoin is a join condition containing something other than an equality operator. The relationship between the EMPLOYEES table and the JOB_GRADES table has an example of a non-equijoin. A relationship between the two tables is that the SALARY column in the EMPLOYEES table must be between the values in the LOWEST_SALARY and HIGHEST_SALARY columns of the JOB_GRADES table. The relationship is obtained using an operator other than equals (=).