sql select records where count greater than 1

Problem description In the production database, the data of one table is 1 billion level, and that of the other table is 10 billion level. The data of other tables is also quite large. I didn't know that these tables had such a large amount of data

Title: rownum cannot be greater than> in Oracle Switch from the network and make slight changes: 1. Description of rownum For the rownum problem of Oracle, many documents say that ">,> =, =, between..." in SQL statements are not supported...

I. Description of the RowNumWith regard to Oracle's rownum problem, many of the data say that the ">, >=, =, between...and" Operators in SQL statements are not supported, and can only be used with the following operation symbols "Not to say ">, >=, =

In the practical application, often need to implement in a query statement to display more than one table of data, this is called a multiple table data record connection query, referred to the next year will be the query. When you implement a

SQL statement optimization improves database performance and SQL statement database performance In systems with unsatisfactory performance, apart from the fact that the application load exceeds the server's actual processing capacity, it is more

MS SQL Server Query optimization methodThere are many reasons for the slow speed of queries, which are common1, no indexes, or no indexes (this is the most common problem with query slowness, is the flaw in programming)2, I/o throughput is small,

The most common operation of database is "plug, check, delete, change". In the previous log, I introduced the MySQL inserts INSERT statement, also introduced the update UPDATE statement for everyone, as well as deletes the statement delete and the

First, the question of the proposedIn the early stage of application system development, because the database data is relatively small, for querying SQL statements, complex view of writing and so on is not aware of the performance of SQL statements,

MySQL is the most basic SQL syntax. For more information, see. The most basic SQL syntax/Statement of MySQL. For more information, see. DDL-Data Definition Language (Create, Alter, Drop, DECLARE) DML-data manipulation language (Select, Delete,

Ø Basic Common Query --select SELECT * from student; --all Query All Select all sex from student; --DISTINCT Filter Repeat Select distinct sex from student; --count Statistics Select COUNT (*) from student; Select count (Sex) from student; Select