Case sensitivity of SQL syntax
Contrary to popular belief, SQL syntax is not completely case-insensitive. Although keywords such as "SELECT", "FROM", and "WHERE" are always treated as uppercase, this is simply a convention.
Case sensitivity of table and column names
However, the case sensitivity of table and column names depends on the specific database system. MySQL provides a configuration option to control this behavior, and on Linux systems, names are case-sensitive by default. Instead, SQL Server case sensitivity is determined by the database's collation settings.
MySQL case sensitivity configuration
MySQL's lower_case_table_names
server option determines whether table and column names are case-sensitive. If this option is set to 1, the name will be converted to lowercase, making it case-insensitive. To enable case sensitivity, set this option to 0.
Collation settings for SQL Server
In SQL Server, collations define character interpretation, including case comparisons. Collations can be case-sensitive or case-insensitive. The following options provide examples of case-sensitive and case-insensitive collations:
区分大小写:SQL_Latin1_General_CP1_CI_AS 不区分大小写:SQL_Latin1_General_CP1_CS_AS
Therefore, the case sensitivity of SQL syntax may be subtle, keywords are generally not case-sensitive, but table and column names may be case-sensitive, depending on the database system and configuration settings.
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