A friend recently asked me to help solve a problem, the problem description:
A table, table has three fields: f1, f2, f3, in which each field there are likely to be between 1 to 9 the number nine…
N randomly selected records of SQL (mysql and sqlserver)
Mysql: select * from tablename order by rand () limit 10
Sqlserver: select top 10 * from tablename order by NEWID ()
Subject to the conditions in the data, from the…
How to achieve this function as early as we certainly know, Fangshanglai is to leave himself a backup 
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