Is MySQL case sensitive?

Is MySQL case sensitive? Detailed analysis needs to be combined with code examples

MySQL is a popular relational database management system that is widely used for data storage and management in various applications. In MySQL, whether to be case sensitive is a common question. It is very important for developers to understand MySQL's case sensitivity rules to avoid unnecessary problems.

In MySQL, there can be different case sensitivities according to different settings. Specifically, MySQL may have different case sensitivities in the following aspects:

1. Is the database name case-sensitive: By default, MySQL does not distinguish database names under Windows systems. Case-sensitive, while database names are case-sensitive under Unix-like systems. You can control whether MySQL distinguishes the case of database names by setting the lower_case_table_names parameter.
2. Whether the table name is case-sensitive: The table name is case-insensitive when created, but when used, it is judged based on the case sensitivity of the file system.
3. Whether column names are case-sensitive: MySQL is case-insensitive by default, but you can control whether column names are case-sensitive by setting the lower_case_table_names parameter.

Next, we use specific code examples to demonstrate whether MySQL is case-sensitive:

-- Create a case-insensitive database
CREATE DATABASE test_db;

--Switch to test_db database
USE test_db;

--Create a case-insensitive table
CREATE TABLE users (
    UserId INT,
    UserName VARCHAR(50)
);

--Insert data
INSERT INTO Users (UserId, UserName)
VALUES (1, 'Alice');

-- Query data
SELECT * FROM users;

In the above code example, we created a case-insensitive database test_db, and created a case-insensitive table users under the database. When inserting and querying data, we used different case forms (Users and users), and MySQL was able to correctly identify the table name and perform corresponding operations.

To summarize, the case sensitivity of MySQL depends on the database and table settings and the file system case sensitivity of the operating system. Developers should handle case issues based on specific circumstances when using MySQL to avoid unnecessary errors.

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