# sql count number of records

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### PHP + MySQL: how to count the numberofrecords in each table in the database and sort the records in descending order. mysql record count _ PHP Tutorial

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

### SQL Server DBA tuning diary (1) -- optimization and principle of the numberofrecords queried in large data volumes

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 numberof statistics, sumcount

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 numberofrecords query-Method of record set object

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

### An alternative method for SQL Server to obtain the total numberof table records

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

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### How big is the difference between count (*) and COUNT (1)?

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>

### Count the numberofrecords per table in the SQL Server database

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

### How to delete duplicate records using SQL statements

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

### How to count the numberofrecords after MySQL is grouped gourp by ()

Select COUNT (*) from table name where condition//This is the total record bar select COUNT (*) from table name where condition GROUP BY ID//This will count the number of records per group.How do I get the total number of records for a second SQL

### Avoid using count (*) to obtain the numberof table records and solve the latency problem.

Today, I encountered such a detailed problem. A colleague used sysindexes. Rows to quickly calculate the number of rows in the table to improve SQL Execution efficiency. The result shows that the number of retrieved rows is not actually the number

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