How to Renumber a Primary Index for Orderly Sequential Values in MySQL?
Published on 2024-11-06
Browse:516
Renumbering Primary Index for Orderly Sequential Values
If your MySQL table's primary index (id) appears in an inconsistent order (e.g., 1, 31, 35, 100), you may desire to rearrange them into a sequential series (1, 2, 3, 4).
To accomplish this, you can employ the following approach without creating a temporary table:
SET @i = 0;
UPDATE table_name SET column_name = (@i := @i 1);This SQL statement initiates a counter variable @i to 0. The UPDATE operation iterates through the table_name and assigns each row's column_name column with the incremented value of the counter.
Latest tutorial
More>
-
The compiler error "usr/bin/ld: cannot find -l" solutionError Encountered: "usr/bin/ld: cannot find -l"When attempting to compile a program, you may encounter the following error message:usr/bin/l...Programming Posted on 2025-05-15 -
How to deal with sliced memory in Go language garbage collection?Garbage Collection in Go Slices: A Detailed AnalysisIn Go, a slice is a dynamic array that references an underlying array. When working with slices, i...Programming Posted on 2025-05-15
-
Is There a Performance Difference Between Using a For-Each Loop and an Iterator for Collection Traversal in Java?For Each Loop vs. Iterator: Efficiency in Collection TraversalIntroductionWhen traversing a collection in Java, the choice arises between using a for-...Programming Posted on 2025-05-15
-
How Do I Efficiently Select Columns in Pandas DataFrames?Selecting Columns in Pandas DataframesWhen dealing with data manipulation tasks, selecting specific columns becomes necessary. In Pandas, there are va...Programming Posted on 2025-05-15
-
How to Implement a Generic Hash Function for Tuples in Unordered Collections?Generic Hash Function for Tuples in Unordered CollectionsThe std::unordered_map and std::unordered_set containers provide efficient lookup and inserti...Programming Posted on 2025-05-15
-
Why can't Java create generic arrays?Generic Array Creation ErrorQuestion:When attempting to create an array of generic classes using an expression like:public static ArrayList<myObjec...Programming Posted on 2025-05-15
-
How to Combine Data from Three MySQL Tables into a New Table?mySQL: Creating a New Table from Data and Columns of Three TablesQuestion:How can I create a new table that combines selected data from three existing...Programming Posted on 2025-05-15
-
How to Convert a Pandas DataFrame Column to DateTime Format and Filter by Date?Transform Pandas DataFrame Column to DateTime FormatScenario:Data within a Pandas DataFrame often exists in various formats, including strings. When w...Programming Posted on 2025-05-15
-
`console.log` shows the reason for the modified object value exceptionObjects and Console.log: An Oddity UnraveledWhen working with objects and console.log, you may encounter peculiar behavior. Let's unravel this mys...Programming Posted on 2025-05-15
-
CSS strongly typed language analysisOne of the ways you can classify a programming language is by how strongly or weakly typed it is. Here, “typed” means if variables are known at compil...Programming Posted on 2025-05-15
-
How to Parse Numbers in Exponential Notation Using Decimal.Parse()?Parsing a Number from Exponential NotationWhen attempting to parse a string expressed in exponential notation using Decimal.Parse("1.2345E-02&quo...Programming Posted on 2025-05-15
-
How to avoid memory leaks when slicing Go language?Memory Leak in Go SlicesUnderstanding memory leaks in Go slices can be a challenge. This article aims to provide clarification by examining two approa...Programming Posted on 2025-05-15
-
How can I safely concatenate text and values when constructing SQL queries in Go?Concatenating Text and Values in Go SQL QueriesWhen constructing a text SQL query in Go, there are certain syntax rules to follow when concatenating s...Programming Posted on 2025-05-15
-
Why do Lambda expressions require "final" or "valid final" variables in Java?Lambda Expressions Require "Final" or "Effectively Final" VariablesThe error message "Variable used in lambda expression shou...Programming Posted on 2025-05-15
-
How to dynamically discover export package types in Go language?Finding Exported Package Types DynamicallyIn contrast to the limited type discovery capabilities in the reflect package, this article explores alterna...Programming Posted on 2025-05-15
Study Chinese
- 1 How do you say "walk" in Chinese? 走路 Chinese pronunciation, 走路 Chinese learning
- 2 How do you say "take a plane" in Chinese? 坐飞机 Chinese pronunciation, 坐飞机 Chinese learning
- 3 How do you say "take a train" in Chinese? 坐火车 Chinese pronunciation, 坐火车 Chinese learning
- 4 How do you say "take a bus" in Chinese? 坐车 Chinese pronunciation, 坐车 Chinese learning
- 5 How to say drive in Chinese? 开车 Chinese pronunciation, 开车 Chinese learning
- 6 How do you say swimming in Chinese? 游泳 Chinese pronunciation, 游泳 Chinese learning
- 7 How do you say ride a bicycle in Chinese? 骑自行车 Chinese pronunciation, 骑自行车 Chinese learning
- 8 How do you say hello in Chinese? 你好Chinese pronunciation, 你好Chinese learning
- 9 How do you say thank you in Chinese? 谢谢Chinese pronunciation, 谢谢Chinese learning
- 10 How to say goodbye in Chinese? 再见Chinese pronunciation, 再见Chinese learning
