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Mysql to achieve lowercase characters to uppercase methods: 1, the use of UPPER () function, syntax "SELECT UPPER (str);"; 2, the use of LOWER () function, syntax "SELECT LOWER (str);"

The operating environment of this tutorial: windows10 system, MySQL version 5.7.24, Dell G3 computer.

Prerequisite: log in to mysql

Open a command line window through the cmd command

Connect to the local database service through the built-in client command mysql of MySQL database

For related commands and operations, please refer to the illustration.

Method 1: complete the conversion from lowercase to uppercase through the built-in function UPPER

UPPER (letter string), all lowercase letters in the substring will be converted to uppercase letters, as shown.

Method 2: complete the conversion from lowercase to uppercase through the built-in function LOWER

All uppercase letters in LOWER (letter string), substring "will be converted to lowercase letters, as shown."

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