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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 33202 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 69454 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 17739 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 11702 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 12105 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 9261 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 10943 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 16121 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 9235 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 6757 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 10192 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 16500 2019-07-22 10:22:41
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- What does sql refer to?
- SQL (Structured Query Language) is a database language with multiple functions such as data manipulation and data definition. This language has interactive characteristics and can provide users with great convenience. Database management systems should make full use of SQL language to improve computer application systems. work quality and efficiency.
- SQL 33221 2019-07-20 15:53:12
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- MongoDB – Polymorphic schema built with schemas
- Brief description: When all documents in a collection have a similar but not identical structure, we call it polymorphic pattern. Example: User posts need to be used in actual business. The general structure of the posts is the same, but the specific content needs to be displayed differently according to different post types.
- SQL 3908 2019-07-01 18:02:05
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- MongoDB – Attribute schema built using schema
- Go directly to understand attribute mode. It is particularly suitable for the following situations: there is a large document, but it actually has some similar fields, and a subset of these fields has the same characteristics. In the end, these subset fields actually need to be sorted or queried.
- SQL 3011 2019-07-01 18:04:56
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