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- SQL performance optimization
- SQL performance optimization in databases has always been a very important issue. Today I will summarize some related issues for you.
- SQL 3309 2019-08-20 15:34:19
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- 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.
- SQL 4973 2019-08-06 17:06:54
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- 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;
- SQL 57805 2019-08-03 14:14:44
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- What are the nosql databases?
- Nosql databases include MongoDB, Cassandra, CouchDB, Hypertable, Redis, Riak, Neo4j, Hadoop HBase, Couchbase, MemcacheDB, REVENDB, Voldemort, etc.
- SQL 33003 2019-08-12 16:11:11
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- 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.
- SQL 69205 2019-08-03 10:40:49
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- 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).
- SQL 17597 2019-08-03 09:29:55
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- 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.
- SQL 11552 2019-07-30 14:57:34
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- 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.
- SQL 11946 2019-07-26 11:43:26
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- 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.
- SQL 9137 2019-07-24 15:36:03
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- 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".
- SQL 10819 2019-07-24 15:17:01
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- 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.
- SQL 15909 2019-07-24 10:15:23
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- 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
- SQL 9033 2019-07-23 09:20:30
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- 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
- SQL 6623 2019-07-22 14:51:45
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- What is sql statement
- SQL (Structured Query Language, Structured Query Language) statement is a language that operates on the database.
- SQL 10015 2019-07-22 11:40:06
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- What is the command to insert records in sql
- The sql command to insert records is INSERT INTO. In SQL, you can use the INSERT INTO command to add all fields and specific columns to the data table.
- SQL 16344 2019-07-22 10:22:41
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