7. The database mydb score table, the first query the database principle & gt;=80 student achievement information, then the query results as data sources, to gather the query, get course total score and sharing information, and then merged into a set of results, according to the following figure, write SQL commands,

CodePudding user response:

Homework more thinking

CodePudding user response:

reference 1/f, three years 丿 response:

homework more thinking

Tried many times, just don't know how in the last two lines,