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Welcome to the MySQL technical articles shared by the great SQL community. If you have any questions or want to learn, you can leave a message in the comment area below. After seeing it, you will answer itThe original content of GreatSQL community cannot be used without authorization. Please contact Xiaobian and indicate the source for reprint. ...

Task05: window functions, etc. - Tianchi Longzhu program SQL training camp Original tutorial link Recommended reference books: SQL basics tutorial Window function Window functions are also called OLAP functions. OLAP is short for online analytical processing, which means real-time analysis and processing of database data. Conventional ...

82.1 problems When the INSERT... SELECT statement inserts data into a table in Parquet or ORC format, dynamic partitioning is enabled and cannot be executed normally Hive client: Task with the most failures(4): Diagnostic Messages for this Task: Error: GC overhead limit exceeded ... FAILED: Execution Error, return code 2 from org.apache.hadoo ...

The simple format of MySQL command granting user permission can be summarized as follows: grant permission on database object to user 1, grant ordinary data users have the right to query, insert, update and delete all table data in the database grant select on testdb.*to common_user@'%'; grant insert on testdb.*to common_user@'%'; grant updat ...

I Introduction to internal rate of return (IRR) The Internal Rate of Return (IRR) is when NPV (net present value) is equal to zero Discount rate . To calculate the internal rate of return, several discount rates are used for trial calculation until the discount rate with net present value equal to or close to zero is found. Internal rate of r ...

Using sql statements to operate the database Create database Syntax: CREATE DATABASE [IF NOT EXISTS] db_name [CHARACTER SET charset_name] [COLLATE collation_name] Where charset_name is the default character set specified for the database Collate is the default collation rule specified for the database (collation rule is a set of rules us ...

1. Project background and demand analysis 1.1 project background E-mail is widely used in enterprises. E-mail is generally used for communication and business between employees and customers. However, due to the lack of awareness of managing e-mail in many enterprises, a large number of e-mail management is chaotic, and there are some hid ...

Welcome to the MySQL technical articles shared by the great SQL community. If you have any questions or want to learn, you can leave a message in the comment area below. After seeing it, you will answer itThe original content of GreatSQL community cannot be used without authorization. Please contact Xiaobian and indicate the source for reprint. ...

1. Preface Recently, a real-time ranking function was implemented for the project (mobile game). The main features are as follows: Real time full service ranking You can query the ranking of a single player Support two-dimensional sorting The amount of data is small, roughly in the range of 1W ~ 50W (opening and closing services will lead ...

Hello, I'm Lao Wu. You can also call me classmate Wu. Younger friends can also call me senior brother Wu. Welcome to the world of data analysis with me and learn together! Interested friends can pay attention to me Data analysis column , there are many high-quality articles to share with you. In addition, you are also welcome to pay attention ...