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SQL performance optimization

SQL performance optimization

SQL performance optimization in databases has always been a very important issue. Today I will summarize some related issues for you.

Aug 19, 2019 am 10:30 AM
性能优化
Detailed introduction to sql injection

Detailed introduction to sql injection

SQL Injection: By inserting SQL commands into Web form submissions or entering query strings for domain names or page requests, it ultimately deceives the server into executing malicious SQL commands. This article will introduce you to the relevant knowledge about SQL injection in detail.

Aug 06, 2019 pm 05:06 PM
sql
How to write sql is not equal to

How to write sql is not equal to

There are two ways to express inequality in SQL, one is "<>" (without quotation marks), the other is "!=" (without quotation marks), the usage is the same. That is where a <> 100; or where a != 100;

Aug 03, 2019 pm 02:14 PM
sql
What are the nosql databases?

What are the nosql databases?

Nosql databases include MongoDB, Cassandra, CouchDB, Hypertable, Redis, Riak, Neo4j, Hadoop HBase, Couchbase, MemcacheDB, REVENDB, Voldemort, etc.

Aug 03, 2019 am 11:09 AM
nosql
What language is sql language?

What language is sql language?

SQL is a Structured Query Language (Structured Query Language), a special-purpose programming language, a database query and programming language, used to access data and query, update and manage relational database systems.

Aug 03, 2019 am 10:40 AM
sql
What is sql?

What is sql?

SQL (Structured Query Language) is a special-purpose programming language used for managing relational database management systems (RDBMS), or for stream processing in relational stream data management systems (RDSMS).

Aug 03, 2019 am 09:29 AM
sql
What is the core and most commonly used operation of the database?

What is the core and most commonly used operation of the database?

The core and most commonly used operations of the database are insert, delete, update and select.

Jul 30, 2019 pm 02:57 PM
数据库
Select statement in sql language

Select statement in sql language

The SELECT statement is used to select data from the database. The results are stored in a results table, called a result set. select syntax: SELECT column name FROM table name or SELECT*FROM table name.

Jul 26, 2019 am 11:43 AM
SQL，select
What is the sql command used to update records in the base table?

What is the sql command used to update records in the base table?

The sql command used to update records in the basic table is Update. Its standard format is: Update table name set field = value where condition. The usage method is slightly different depending on the source of the data.

Jul 24, 2019 pm 03:35 PM
SQL，更新记录
What problems may arise from concurrent database operations?

What problems may arise from concurrent database operations?

The quality of the concurrency control mechanism is one of the important indicators of measuring the performance of a database management system. Concurrent database operations may cause three problems: 1. Lost updates. 2. Non-repeatable reading. 3. Read "dirty data".

Jul 24, 2019 pm 03:17 PM
数据库
What is pointed out by using where clause in sql query

What is pointed out by using where clause in sql query

The where clause is used in sql queries to indicate the query conditions. The WHERE clause is used to extract records that meet specified criteria.

Jul 24, 2019 am 10:15 AM
SQL查询
Database backup and recovery solution

Database backup and recovery solution

SQL SERVER backup method. Based on data security requirements, the recommended backup methods are a full backup once a week, a differential backup once a day, and a transaction log backup every half hour. Restoring a backup requires restoring the full backup first, then the differential backup, and then the transaction log backup. Restore the database to the state at the time of the transaction log backup

Jul 22, 2019 pm 06:22 PM
sql 数据库
sql command to update records

sql command to update records

There are two usages of SQL update statements: 1. Update a column: UPDATE table name SET column name = new value WHERE column name = a certain value. 2. Update several columns: UPDATE table name SET column 1 name = new value, column 2 name = new value WHERE column name = a certain value

Jul 22, 2019 pm 02:51 PM
sql
What is sql statement

What is sql statement

SQL (Structured Query Language, Structured Query Language) statement is a language that operates on the database.

Jul 22, 2019 am 11:40 AM
sql

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