1:例子,有一张book表 2:执行sql求和 SELECTsum(age)
FROMstudent
GROUP BYage; 3:加上with ROLLUP 查询结果会加上一行,显示总和
SELECTsum(age)
FROMstudent
GROUP BYage with ROLLUP;
Archive for required library: *****org/javassist/javassist/3.21.0-GA/javassist-3.21.0-GA.jar in project SpringBootTest cannot be read or is not a valid ZIP file出现以上错误,表示下载的jar包不可多,多半原因是下载过程中中途网络中断或其它原…