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  MongoDB multi-condition query

  1. View the collection show collections2. Add data db.runoob.insertMany ([{'title':'data1','url':' https://blog.51cto.com] to the collection

  2022-06-01 18:16:13 Views: 294
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  SQL- gives a little bit of foundation to friends who want to learn database.

  SQL is a standard computer language for accessing and processing databases. How to use SQL to access and process data in data systems, such databases include: MySQL, SQL Server, Access, Oracle, Sybase, DB2 and so on.

  2022-06-01 18:16:13 Views: 251
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  Conversion between mysql UNIX timestamp and date

  UNIX timestamp conversion function: FROM_UNIXTIME () select FROM_UNIXTIME (1156219870); date conversion to UNIX timestamp function: UNIX_TIMESTAMP () Se

  2022-06-01 18:16:13 Views: 209
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  50 suggestions for MongoDB developers Tip21

  This series of articles are translated from "50 Tips and Tricks for MongoDB Developers". I can't find the Chinese version for the time being. Anyway, I have been studying mongodb deeply recently, so I just want to translate it. On the one hand, strengthen yourself.

  2022-06-01 18:16:13 Views: 214
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  What should the large list report do?

  When querying data, we sometimes encounter inventory reports with a large amount of data. The query conditions entered by the user are very broad, and tens of millions of rows or even hundreds of millions of records may be found from the database. If you wait for all these records to be retrieved before generating the report, it will take a long time and the user experience will be bad; and

  2022-06-01 18:16:09 Views: 291
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  Introduction to MySQL transactions and InnoDB lock types

  This article gives you an introduction to MySQL transactions and InnoDB lock types. The article covers the knowledge of MySQL transactions and InnoDB lock types. I hope you can get something from this article. 1. Isolation level of transaction 1, 4 isolation levels (1) uncommitted read (

  2022-06-01 18:16:08 Views: 228
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  Three minutes to understand mysql transaction knowledge

  This article mainly gives you a brief talk about the knowledge of mysql affairs. You can look up the relevant professional terms on the Internet or find some related books to supplement them. We will not dabble here. Let's go straight to the topic. I hope this article on the knowledge of mysql transactions can bring you some practical help. Mysql

  2022-06-01 18:16:02 Views: 244
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  NoSQL--Redis 2.4--Sorted Set

  First, Overview: Sorted-Set is an upgraded version of Set, which adds sorting function on the basis of Set. Sorted-Sets has a score associated with each member, and Redis uses scores to help members of the collection grow up.

  2022-06-01 18:16:02 Views: 203
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  Implementation of Group packet query of MongoDB under MongoVUE

  We know that MongoDB is a non-relational database, so its query method is very different from the standard structured query language SQL. But no matter how complex a structure it is, when it passes through the hands of the developer, it can only become the structure that the customer wants. What we're going to talk about today is

  2022-06-01 18:16:02 Views: 205
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  A simple operation method for backing up MYSQL

  The following mainly brings you the simple operation method of backing up MYSQL. I hope these contents can bring you practical use, which is also the main purpose of this article. All right, don't talk too much nonsense, let's just read the following. Types and characteristics of backup cold backup (c

  2022-06-01 18:15:50 Views: 237
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  What should be paid attention to when writing data in bulk in mysql table

  This article mainly introduces what you need to pay attention to when writing data in bulk in the mysql table. The content of the article is carefully selected and edited by the author, which has a certain pertinence and is of great reference significance to everyone. Let's work with the author to understand what we need to pay attention to when writing data in bulk in the mysql table.

  2022-06-01 18:15:47 Views: 276
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  New support for MySQL 5.7How to create Json type indexes

  Let's learn about the new MySQL 5.7support-how to create an Json type index. I'm sure you'll benefit a lot after reading it. I hope MySQL 5.7will support it. This short article on how to create an Json type index

  2022-06-01 18:15:46 Views: 259
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  Common sentences in oracle

  1.decode function (minor version of case when) select decode (pd.discount_id,null,'',' purchase'| | pd.product_count | |','| | pd.prod

  2022-06-01 18:15:46 Views: 233
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  Hot standby of redhat6.5 heartheartbeat+drbd+mysql main library

  One environment preparation 1 environment hostname network card disk mastereth0 bridge mode eth0 (192.168.1.10) Custom mode (VMnet2) (192.168.2.10) VIP 192.168.1.200 Universe 210

  2022-06-01 18:15:27 Views: 286
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  New features and enhancements in AlwaysOn 2017

  New features in AlwaysOn 2017 and enhancements to AlwaysOn 2017: l availability group parameter configuration: minimum number of secondary copies submitted (REQUIRED_COPIES_TO_COMMIT) l read scaling availability group (

  2022-06-01 18:15:20 Views: 273
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  AWS SDK Python

  Install pip[ root @ xxxxxx ~] # python get-pip.pyCollecting pip Downloading https://files.pythonhosted.org/pa

  2022-06-01 18:15:20 Views: 236
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  Related Operation of GBK character set and UTF8 character Encoding in MySQL

  The following is about the operations related to the GBK character set and UTF8 character encoding in MySQL. The secret of the text is that it is close to the topic. So, let's not talk about gossip. let's just read the following. I believe that after reading this article on the operation of GBK character set and UTF8 character coding in MySQL.

  2022-06-01 18:15:20 Views: 280
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  The best way to store a directory by specifying table data files in MySQL

  I don't know if you have any knowledge about the articles like MySQL that specify the best way to store directories for table data files. Today, I'm here to tell you briefly. If you are interested, let's take a look at the body. I believe that after reading the specified table data file in MySQL, the most important thing is to store the directory.

  2022-06-01 18:15:19 Views: 217
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  Related operations of sql statements under MySQL

  The following brings you about the operation of the sql sentence under MySQL. I believe you must have read similar articles. What's the difference between what we bring to everyone? Let's take a look at the body. I believe you will gain something after reading the relevant operations of the sql sentence under MySQL. 1. To the table

  2022-06-01 18:15:19 Views: 272
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  Install Xtrabackup to back up MySQL detailed steps

  Below, I will give you a brief introduction to the detailed steps of installing Xtrabackup to implement backup MySQL. Have you learned about similar topics before? If you are interested, let's take a look at this article. I believe that after reading the detailed steps of installing Xtrabackup to implement backup MySQL

  2022-06-01 18:15:19 Views: 226