How to use the CONV function in MySQL to convert a numerical value to a different base

How to use the CONV function in MySQL to convert a value to different bases

Introduction:
In the database, it is often necessary to convert values ​​between different bases. MySQL provides a very convenient function CONV, which can quickly realize hexadecimal conversion of numerical values. This article details how to use the CONV function and provides some code examples.

1. Overview of CONV function
The CONV function is a mathematical function provided by MySQL, which is used to convert a value from one base to another. Its syntax is as follows:
CONV(N,from_base,to_base)

Among them, N is the value to be converted (must be an integer), from_base is the original base, and to_base is the target base. The function return value is the result of converting N from from_base to to_base.

2. Base conversion examples
The following are some common base conversion examples to help readers better understand the usage of the CONV function.

1. Convert decimal to binary
   The reference code is as follows:
   SELECT CONV(236, 10, 2); -- Return result: 11101100
2. Convert binary to Decimal
   The reference code is as follows:
   SELECT CONV(11101100, 2, 10); --Return result: 236
3. Convert decimal to hexadecimal
   The reference code is as follows:
   SELECT CONV(236, 10, 16); -- Return result: EC
4. Convert hexadecimal to decimal
   The reference code is as follows:
   SELECT CONV('EC', 16, 10); -- Return result: 236
5. Convert decimal to octal
   The reference code is as follows:
   SELECT CONV(236, 10, 8); -- Return result: 354
6. Convert octal to decimal
   The reference code is as follows:
   SELECT CONV('354', 8, 10); -- Return result: 236

3. Using the CONV function Notes
When using the CONV function, you need to pay attention to the following points:

1. The value range of N
   The value range of N must be between [-9223372036854775808, 9223372036854775807]. Values ​​outside this range will not be converted normally.
2. Base range
   The value range of from_base and to_base must be between 2 and 36. Values ​​outside this range will cause the function call to fail.
3. The case of the returned result
   The CONV function will return the result in uppercase letters by default. If you need to return lowercase letters, you can use the LOWER function to convert.

4. Summary
The CONV function is a powerful tool for base conversion in MySQL, which can quickly convert values ​​between different bases. Through the CONV function, we can easily convert decimal values ​​to binary, hexadecimal, octal and other other base systems, and we can also convert other base values ​​to decimal. When using the CONV function, you need to pay attention to the range of N, the base range, and the case of the returned result. I believe that after the introduction of this article, readers have mastered the use of CONV function and can flexibly apply it in actual development.

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