sql server跟my sql 命令(语句)的区别,sql server与mysql的比
sql server和my sql 命令(语句)的区别,sql server与mysql的比较 sql与mysql的比较 1、连接字符串 sql :Initial Catalog(database)=x; --数据库名称 Data Source(source)=x; --服务器 Persist Security Info=True; --集成sql server身份验证 Integrated Sec
sql server和my sql 命令(语句)的区别,sql server与mysql的比较sql与mysql的比较
1、连接字符串
sql :Initial Catalog(database)=x; --数据库名称
Data Source(source)=x; --服务器
Persist Security Info=True; --集成sql server身份验证
Integrated Security=True --集成windows身份验证
User ID(uid)=x; --用户名
Password(pwb)=x; --密码
mysql:Database=x; --数据库名称
Data Source=x; --服务器
User Id(uid)=bizhi; --用户名
Password=x; --密码
pooling=false; --
CharSet=utf8; --编码
port=x --端口
2、连接对象
sql :SqlConnection
mysql:MySqlConnection
3、命令:
sql :SqlCommand
mysql:MySqlCommand
4、参数
sql :SqlParameter
mysql:MySqlParameter
5、填充:
sql :SqlDataAdapter
mysql:MySqlDataAdapter
6、查询所有库
sql :select * from [master]..[SysDatabases];
mysql:SHOW DATABASES;
7、显示指定库的所有表
sql :select * from [_DatatBaseName]..[SysObjects] where [type]='U';
mysql:USE _DatatBaseName; SHOW TABLES;
8、显示指定库的指定表的所有字段
sql :select top 0 * from [_DatatBaseName]..[_TableName];
select * from [syscolumns] where [ID]=OBJECT_ID('BPM..OrderFollow');
mysql:USE _DatatBaseName; SHOW COLUMNS FROM _TableName;
USE _DatatBaseName; DESCRIBE _TableName;
9、查询当前时间
sql :select getdate();
mysql:SELECT NOW();
10、备份数据库
sql :backup _DatatBaseName to disk='d:\123.bak';
mysql:
11、创建数据库
sql :use master
go
--删除数据库
if exists(select * from sysdatabases where name='kl')
drop database [HBDataBase]; --删除
go
--创建数据库
create database [kl]
on --主文件
(
name='kl',
size=3mb,
filename='D:\kl.mdf',
maxsize=100mb,
filegrowth=1mb
)
log on --日志文件
(
name='kl_Log',
filename='D:\kl.ldf',
size=1mb,
maxsize=5mb,
filegrowth=5%
)
go
mysql:CREATE DATABASE _DatatBaseName;
12、分页
sql :top N
ROW_NUMBER() over(order by xx desc )
mysql:limit
13、添加的自增列
sql :insert into xx(bb) output inserted.vv vlaues('');
select @@identity;
mysql:SELECT @@session.identity;

The steps for upgrading MySQL database include: 1. Backup the database, 2. Stop the current MySQL service, 3. Install the new version of MySQL, 4. Start the new version of MySQL service, 5. Recover the database. Compatibility issues are required during the upgrade process, and advanced tools such as PerconaToolkit can be used for testing and optimization.

MySQL backup policies include logical backup, physical backup, incremental backup, replication-based backup, and cloud backup. 1. Logical backup uses mysqldump to export database structure and data, which is suitable for small databases and version migrations. 2. Physical backups are fast and comprehensive by copying data files, but require database consistency. 3. Incremental backup uses binary logging to record changes, which is suitable for large databases. 4. Replication-based backup reduces the impact on the production system by backing up from the server. 5. Cloud backups such as AmazonRDS provide automation solutions, but costs and control need to be considered. When selecting a policy, database size, downtime tolerance, recovery time, and recovery point goals should be considered.

MySQLclusteringenhancesdatabaserobustnessandscalabilitybydistributingdataacrossmultiplenodes.ItusestheNDBenginefordatareplicationandfaulttolerance,ensuringhighavailability.Setupinvolvesconfiguringmanagement,data,andSQLnodes,withcarefulmonitoringandpe

Optimizing database schema design in MySQL can improve performance through the following steps: 1. Index optimization: Create indexes on common query columns, balancing the overhead of query and inserting updates. 2. Table structure optimization: Reduce data redundancy through normalization or anti-normalization and improve access efficiency. 3. Data type selection: Use appropriate data types, such as INT instead of VARCHAR, to reduce storage space. 4. Partitioning and sub-table: For large data volumes, use partitioning and sub-table to disperse data to improve query and maintenance efficiency.

TooptimizeMySQLperformance,followthesesteps:1)Implementproperindexingtospeedupqueries,2)UseEXPLAINtoanalyzeandoptimizequeryperformance,3)Adjustserverconfigurationsettingslikeinnodb_buffer_pool_sizeandmax_connections,4)Usepartitioningforlargetablestoi

MySQL functions can be used for data processing and calculation. 1. Basic usage includes string processing, date calculation and mathematical operations. 2. Advanced usage involves combining multiple functions to implement complex operations. 3. Performance optimization requires avoiding the use of functions in the WHERE clause and using GROUPBY and temporary tables.

Efficient methods for batch inserting data in MySQL include: 1. Using INSERTINTO...VALUES syntax, 2. Using LOADDATAINFILE command, 3. Using transaction processing, 4. Adjust batch size, 5. Disable indexing, 6. Using INSERTIGNORE or INSERT...ONDUPLICATEKEYUPDATE, these methods can significantly improve database operation efficiency.

In MySQL, add fields using ALTERTABLEtable_nameADDCOLUMNnew_columnVARCHAR(255)AFTERexisting_column, delete fields using ALTERTABLEtable_nameDROPCOLUMNcolumn_to_drop. When adding fields, you need to specify a location to optimize query performance and data structure; before deleting fields, you need to confirm that the operation is irreversible; modifying table structure using online DDL, backup data, test environment, and low-load time periods is performance optimization and best practice.


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

MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function

SublimeText3 English version
Recommended: Win version, supports code prompts!

SublimeText3 Linux new version
SublimeText3 Linux latest version

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