有的时间我想把数据库中表的记录统计一下,如果我们一个一个表的操作可以直接select count(*) from tablename就可以然后一个个相加,但是如果有上百个表有没有更简单的方法呢,下面我总结了一些方法有需要的朋友可参考。
如果是要得到中所有表的条数呢?我们来看几种最常见的方式:
--方法一
代码如下 | 复制代码 |
b.name as tablename , c.row_count as datacount from sys.indexes a , sys.objects b , sys.dm_db_partition_stats c where a.[object_id] = b.[object_id] AND b.[object_id] = c.[object_id] AND a.index_id = c.index_id AND a.index_id AND b.is_ms_shipped = 0 |
--方法二
代码如下 | 复制代码 |
select b.name as tablename , a.rowcnt as datacount from sysindexes a , sysobjects b where a.id = b.id and a.indid and objectproperty(b.id, 'IsMSShipped') = 0 |
--方法三
代码如下 | 复制代码 |
if exists ( select * from dbo.sysobjects where id = object_id(N'[dbo].[TableSpace]') and objectproperty(id, N'IsUserTable') = 1 ) drop table [dbo].[TableSpace] go create table TableSpace ( TableName varchar(20) , RowsCount char(11) , Reserved varchar(18) , Data varchar(18) , Index_size varchar(18) , Unused varchar(18) ) go declare @sql varchar(500) declare @TableName varchar(20) declare mCursor cursor for select name from sysobjects where xtype='U' open mCursor fetch NEXT from mCursor into @TableName while @@fetch_status = 0 begin set @sql = 'insert into TableSpace ' set @sql = @sql + ' exec sp_spaceused ''' + @TableName + ''' ' exec (@sql) fetch NEXT from mCursor into @TableName end close mCursor deallocate mCursor go --显示结果 select TableName,RowsCount from TableSpace |
--建议使用后两种方式,对于SQL SERVER 2005来说,三种方法都好使,如果是其他板本,可以逐一测试一下。
方法四
--==========================================================================
-- 说明: 本脚本用于查询当前中所有表格的记录条数
-- 并将结果存入tableinfo表中,不会删除以备用户再做处理与分析
-- 不过,最后请用户删除此表。
--==========================================================================
代码如下 | 复制代码 |
if exists (select * from dbo.sysobjects where id = object_id(n[dbo].[tablespace]) and objectproperty(id, nisusertable) = 1) create table tablespace declare @sql varchar(500) declare cursor1 cursor open cursor1 while @@fetch_status = 0
--查看库的使用状况,可以随时执行的。 |

InnoDBBufferPool reduces disk I/O by caching data and indexing pages, improving database performance. Its working principle includes: 1. Data reading: Read data from BufferPool; 2. Data writing: After modifying the data, write to BufferPool and refresh it to disk regularly; 3. Cache management: Use the LRU algorithm to manage cache pages; 4. Reading mechanism: Load adjacent data pages in advance. By sizing the BufferPool and using multiple instances, database performance can be optimized.

Compared with other programming languages, MySQL is mainly used to store and manage data, while other languages such as Python, Java, and C are used for logical processing and application development. MySQL is known for its high performance, scalability and cross-platform support, suitable for data management needs, while other languages have advantages in their respective fields such as data analytics, enterprise applications, and system programming.

MySQL is worth learning because it is a powerful open source database management system suitable for data storage, management and analysis. 1) MySQL is a relational database that uses SQL to operate data and is suitable for structured data management. 2) The SQL language is the key to interacting with MySQL and supports CRUD operations. 3) The working principle of MySQL includes client/server architecture, storage engine and query optimizer. 4) Basic usage includes creating databases and tables, and advanced usage involves joining tables using JOIN. 5) Common errors include syntax errors and permission issues, and debugging skills include checking syntax and using EXPLAIN commands. 6) Performance optimization involves the use of indexes, optimization of SQL statements and regular maintenance of databases.

MySQL is suitable for beginners to learn database skills. 1. Install MySQL server and client tools. 2. Understand basic SQL queries, such as SELECT. 3. Master data operations: create tables, insert, update, and delete data. 4. Learn advanced skills: subquery and window functions. 5. Debugging and optimization: Check syntax, use indexes, avoid SELECT*, and use LIMIT.

MySQL efficiently manages structured data through table structure and SQL query, and implements inter-table relationships through foreign keys. 1. Define the data format and type when creating a table. 2. Use foreign keys to establish relationships between tables. 3. Improve performance through indexing and query optimization. 4. Regularly backup and monitor databases to ensure data security and performance optimization.

MySQL is an open source relational database management system that is widely used in Web development. Its key features include: 1. Supports multiple storage engines, such as InnoDB and MyISAM, suitable for different scenarios; 2. Provides master-slave replication functions to facilitate load balancing and data backup; 3. Improve query efficiency through query optimization and index use.

SQL is used to interact with MySQL database to realize data addition, deletion, modification, inspection and database design. 1) SQL performs data operations through SELECT, INSERT, UPDATE, DELETE statements; 2) Use CREATE, ALTER, DROP statements for database design and management; 3) Complex queries and data analysis are implemented through SQL to improve business decision-making efficiency.

The basic operations of MySQL include creating databases, tables, and using SQL to perform CRUD operations on data. 1. Create a database: CREATEDATABASEmy_first_db; 2. Create a table: CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY, titleVARCHAR(100)NOTNULL, authorVARCHAR(100)NOTNULL, published_yearINT); 3. Insert data: INSERTINTObooks(title, author, published_year)VA


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

Dreamweaver Mac version
Visual web development tools

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software