how to count number of records in sql

PHP + MySQL calculates the number of records for each table in the database and sorts the records in descending order. PHP + MySQL calculates the number of records for each table in the database and sorts the records in descending order, mysql

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

Odd sum (1), sum (2), count (1), count (6), count (*) in SQL: Total number of statistics, sumcountSQL statistical functions The SQL statistical function has count statistics, and uses sum to accumulate the specified field value with sum, but note

How to use ASP to count the total number of query records A small Retrieval System Implemented by ASP requires statistics on the retrieved records each time. How can this problem be achieved? Generate a record set and then count the number of

Count the number of records per table in a SQL Server database use Jydb--Jydb for your database goselect b.[name] ' table name ', max (a.rowcnt) ' Record count ' from Sysinde Xes A join sys.objects B on b.object_id=a.id where b.type= ' U ' GROUP by

To get the total number of records for a table, the common practice is: The reference content is as follows: selectcount (*) from table name; this practice is not done, I am mainly talking about efficiency issues here. When the number of records in

The number of records in the database table is: Sql> Select COUNT (*) from table_name t; COUNT (*)----------6873 1, using the statistical results of COUNT (*): Sql> alter session Set Nls_language = "American"; Session altered. Sql> set timing on;Sql>

The example in this article describes the method by which Php+mysql counts the number of records in each table in the library and in descending order. Share to everyone for your reference, as follows: This is a simple code that implements the

Original post address: http://www.cnblogs.com/phpliu/archive/2010/06/21/1761726.html For example:ID name value1 A PP2 A PP3 B III4 B PP5 B PP6 c pp7 c pp8 C IIIID is the primary keyThis result is required.ID name value1 A PP3 B III4 B PP6 c pp8 C

Share the following method of deleting duplicate records in a database with an SQL statement.For example, there is now a person table (table name: peosons)If you want to name, ID, address, the three fields exactly the same record querySelect p1.*