Identifier Case Sensitivity mysql>  SELECT  col_name  FROM  tbl_name  AS a WHERE a. col_name  = 1 OR A. col_name  = 2; However, this same statement is permitted on Windows. To avoid problems caused by such differences, it is best to adopt a consistent convention, such as always creating and referring to databases and tables using lowercase names. This convention is recommended for maximum portability and ease of use. How table and database names are stored on disk and used in MySQL is affected by the lower_case_table_names  system variable.  lower_case_table_names  can take the values shown in the following table. This variable does  not  affect case sensitivity of trigger identifiers. On Unix, the default value of  lower_case_table_names  is 0. On Windows, the default value is 1. On macOS, the default value is 2. lower_case_table_names  can only be configured when initializing the server. Changing the lower_case_table_names  setting after the server is initialized is prohibited. Value Meaning 0 Table and database names are stored on disk using the lettercase specified in the  CREATE TABLE  or  CREATE DATABASE  statement. Name comparisons are case-sensitive. You should  not set this variable to 0 if you are running MySQL on a system that has case-insensitive file names (such as Windows or macOS). If you force this variable to 0 with  --lower-case-table-names=0  on a case-insensitive file system and access  MyISAM tablenames using different lettercases, index corruption may result. 1 Table names are stored in lowercase on disk and name comparisons are not case-sensitive. MySQL converts all table names to lowercase on storage and lookup. This behavior also applies to database names and table aliases. 2 Table and database names are stored on disk using the lettercase specified in the  CREATE TABLE or  CREATE DATABASE  statement, but MySQL converts them to lowercase on lookup. Name comparisons are not case-sensitive. This works only  on file systems that are not case-sensitive! InnoDB  table names and view names are stored in lowercase, as for  lower_case_table_names=1 . If you are using MySQL on only one platform, you do not normally have to use a lower_case_table_names  setting other than the default. However, you may encounter difficulties if you want to transfer tables between platforms that differ in file system case sensitivity. For example, on Unix, you can have two different tables named  my_table  and  MY_TABLE , but on Windows these two names are considered identical. To avoid data transfer problems arising from lettercase of database or table names, you have two options: •Use  lower_case_table_names=1  on all systems. The main disadvantage with this is that when you use  SHOW TABLES  or  SHOW DATABASES , you do not see the names in their original lettercase. •Use  lower_case_table_names=0  on Unix and  lower_case_table_names=2  on Windows. This preserves the lettercase of database and table names. The disadvantage of this is that you must ensure 1874