The table structure is as follows:
The code is as follows
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Mysql> Show CREATE TABLE Userg;1. Row ***************************Table:userCreate table:create Table ' user ' (' ID ' int (a) unsigned not NULL
The table structure is as follows:Mysql> Show CREATE TABLE user\g;*************************** 1. Row *************************** table:usercreate table:create Table ' user ' ( ' id ' int (ten) unsigned not NULL AUTO _increment, ' name '
Tested under MySQL 5.6.MyISAM Engine:When creating a data table, MySQL generates 3 files, respectively (table: Test):TEST.FRM, Test. MYD, Test. Myi file,TEST.FRM is the table structure, Test.myd is the file that holds the data, Test.myi is the file
Mysql count details and function instance code, mysqlcount
Mysql count details
The count function is a function used to count records in tables or arrays. The following describes how to use the count function in mysql.
Count (*) returns the number
For details about how to use the count function in MySQL, mysqlcount
The count function is a function used to count records in tables or arrays. Here we will introduce the usage and Performance Comparison of the count function in MySQL.
Count (*)
Usage of the count function in MySQL
The count function is a function used to count records in tables or arrays. Here we will introduce the usage and Performance Comparison of the count function in MySQL. Count (*) returns the number of rows to be
Execution effect:
1. Count (1) and COUNT (*) when the table has a larger amount of data, using count (1) is more time-consuming than using count (*) when analyzing the table. From the execution plan, the effect of count (1) and COUNT (*) is the
The count function is a function used to count records in tables or arrays. Here we will introduce the usage and Performance Comparison of the count function in mysql.
Count (*) returns the number of rows to be retrieved, whether or not it contains
The test results are: count (*) and COUNT (1) are basically equal, count (non-primary key field) is the most cost-consuming--Data Volume 708254Select COUNT (*) from tmp_test1;--avg 0.2240.2290.2190.2270.2220.2150.2240.2250.2210.2400.219Select COUNT (
COUNT (*) it returns the number of rows retrieved, regardless of whether they contain null values.SELECT retrieves from one table without retrieving other columns, and when there is no WHERE clause, COUNT (*) is optimized to the fastest return speed.
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