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SQL

PolarDB-X Best Practice Series (2): How to Implement Efficient Paged Queries

This article introduces how to efficiently perform paging operations in a standalone database or distributed database.

PolarDB-X Best Practice Series (1): How to Design a User Table

This article describes how to desgine a user table efficiently.

MySQL Memory Allocation and Management (Part II)

This article introduces the structure and usage of InnoDB memory. The code is based on version 8.0.25.

MySQL Memory Allocation and Management (Part I)

This article introduces the memory allocation manager at the InnoDB layer and the SQL layer, including ut_allocator, mem_heap_allocator, and MEM_ROOT.

MySQL Memory Allocation and Management (Part III)

This article interprets the MySQL memory limit feature. The code is based on version 8.0.28.

MaxCompute Unleashed - Part 12: PIVOT/UNPIVOT

This article introduces the new syntax supported by MaxCompute - PIVOT/UNPIVOT.

MaxCompute Unleashed - Part 13: Global Zorder

This article introduces the support of Global Z-Order in MaxCompute.

MaxCompute Unleashed - Part 11: QUALIFY Clause

Part 11 of the "Unleash the Power of MaxCompute" series introduces the features and use of QUALIFY Clause.

MaxCompute Unleashed - Part 10: IF ELSE Branch Statement

Part 10 of the "Unleash the Power of MaxCompute" series introduces the script mode and parameterized views of MaxCompute.

MaxCompute Unleashed - Part 7: Grouping Set, Cube and Rollup

Part 7 of the "Unleash the Power of MaxCompute" series introduces MaxCompute's support for GROUPING SETS.

MaxCompute Unleashed - Part 3: Complex Type Functions

Part 3 of the “Unleash the Power of MaxCompute” series describes the complex type functions of MaxCompute.

MaxCompute Unleashed - Part 2: Basic Data Types and Built-in Functions

Part 2 of the “Unleash the Power of MaxCompute” series describes the basic data types and built-in functions of MaxCompute.

MaxCompute Unleashed - Part 5: SELECT TRANSFORM

Part 5 of the "Unleash the Power of MaxCompute" series introduces the support of MaxCompute for other scripting languages - SELECT TRANSFORM.

MaxCompute Unleashed - Part 4: CTE, VALUES, SEMIJOIN

Part 4 of the "Unleash the Power of MaxCompute" series describes the improvements of MaxCompute in the SQL DML.

MaxCompute Unleashed - Part 6: User Defined Type

Part 6 of the "Unleash the Power of MaxCompute" series describes a new feature called User Defined Type (UDT).

MaxCompute Unleashed - Part 1: Harnessing Compiler Errors and Warnings Effectively

Part 1 of the “Unleash the Power of MaxCompute” series describes the improvements of MaxCompute in usability.

How to Make Full Use of SQL Capabilities?

The focus of this article is maximizing SQL capabilities. It explores a unique approach, using basic syntax to solve complex data scenarios through flexible and divergent data processing thinking.

Overview of New Features of SQL Server 2022

This article describes an overview of the newly released features in SQL Server 2022 and the authors’s personal understanding of each function as a user.

Protecting Your Website: How WAFs Are Enhancing Website Security

In a bypass attack, the attacker's primary goal is to acquire information and inject a file or web shell code into the targeted system.

Using PostgreSQL Recursive SQL and the PL/pgSQL Function to Draw Fractal Graphs

This article explains how to use PostgreSQL Recursive SQL and the PL/pgSQL function to draw fractal graphs (with examples).