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Label:There is a connection operation between the SQL statements, which must be used in some complex data operations. Simply put, the result of an SQL statement can be part of a connected SQL operation. SQL Structured query statements, subqueries refer to all SQL operations, not a single SELECT statement. 1. Generated by comparison operators: SELECT user_name,user_idfromWHERE>=(SELECTROUND( AVG (age),0 from users); You can use Any,some,all to make queries. SELECT user_name,user_idfromWHERE>= any

Also used for recording for future contact! It basically contains the advanced usage of general SQL!drop table if exists stu;create table stu (name varchar (), age int,stuid int not null PRIMARY key Auto_increment,idnum int , sex varchar (+), check (Sex in (' Male ', ' female ')) Charset=utf8;insert into Stu (name,age,idnum,sex) VALUES (' Damon ', 789,4678945 , ' Male '), insert into Stu (Name,age,idnum,sex) VALUES (' Coco ', 13,345, ' female '), insert into Stu (Name,age,idnum,sex) VALUES (' Ki

case-L,--limit,-N Limit limit output (or counting) to limit entries-m,--mmap Ignored, for backward compatibility-p,--nofollow,-H don ' t follow trailing symbolic links when checking file Exis tence-0,--null separate entries with NUL on output-s,--statistics don ' t search for entries, print Statistics about eachused database-q,--quiet quiet mode, will not display any error messages-R,--regexp regexp use basic regular Expressions--regex Use