In MySQL, the quote character is the backtick (`). In MySQL, an unquoted identifier may begin with a digit, and double quotation marks are allowed in a quoted identifier however, neither of these is allowed in an Oracle identifier. MySQL and Oracle have some minor differences in their definition of an identifier. SQL Developer appends an underscore (_) to the name of a MySQL object that is an Oracle reserved word. However, MySQL allows some reserved words such as DATE and TIMESTAMP to be used as unquoted identifier for object names, although this is not allowed in Oracle. Table aliases are case-sensitive in releases before MySQL 4.1.1.īoth Oracle and MySQL let you use reserved words as object names by representing the name with a quoted identifier. However, MySQL allows users to determine how the database and table names are stored on disk and in their use in MySQL through the lower_case_table_names system variable. This means that database and table names are not case-sensitive in Windows and are case-sensitive in most varieties of Unix. As such, the case sensitivity of the database and table names is determined by the case sensitivity of the underlying operating systems. In MySQL, databases correspond to directories within the data directory, and tables correspond to one or more files within the database directory. However, the case sensitivity of database and tables names for MySQL differs from Oracle. Oracle is case insensitive to object names, and Oracle schema object names are stored as uppercase.Īs in Oracle, column, index, stored procedure, and trigger names as well as column aliases in MySQL are case insensitive on all platforms. Alternately, though less satisfactory for auditing, users performing tasks as a role may all share a single user account that is designated for the "role" and with the required privileges granted. Thus, in order to grant a group of users the same set of privileges, the privileges have to be granted to each user separately. Unlike in Oracle, there is no concept of role in MySQL. These per-object privileges are named after the SQL queries that trigger their checks. The per-object privileges affect database objects such tables, columns, indexes, and stored procedures, and can be granted with a different scope. These administrative privileges include the FILE, PROCESS, REPLICATION, SHUTDOWN and SUPER privilege. The administrative privileges are global privileges that have server-wide effects and are concerned with the functioning of MySQL. The privileges supported by MySQL are grouped into two types: administrative privileges and per-object privileges. When performing a privilege check, MySQL checks each of the tables in descending order of the scope of the privileges, and the privileges granted at a lower level take precedence over the same privileges granted at a higher level. MySQL allows privileges to be granted at five different levels, in descending order of the scope of the privileges:Ĭolumn-specific (single column in a single tableĮach level has a corresponding grant table in the database. Privileges granted at a higher level are implicitly passed down to all lower levels and may be overridden by the same privileges set at lower levels. The MySQL privilege system is a hierarchical system that works through inheritance.
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