Triggers, stored procedures, and views are scheduled for implementation in the future. The following statements are equivalent: They can be given in any lettercase. Databases and tables in MySQL are implemented using directories and files in the underlying file system on the server host. Form Controls You can choose the form control such as checkbox, textbox, textarea which will be in the insert and update forms. Names for databases, tables, columns, and indexes can be up to 64 characters long. You should consider lettercase issues if you create a database on a server with case-sensitive filenames and you might someday move the database to a server where filenames are not case sensitive. The UNIX pathname separator is disallowed on Windows and vice versa to make it easier to transfer databases and tables between servers running on different platforms. That's probably because for many or most applications, those features don't matter. Do these omissions mean that MySQL isn't a "real" database system? Such features include triggers, stored procedures, and views.
Names are subject to case sensitivity considerations, which are described as well. Similarly, if a query uses multiple tables and refers to a column name that is present in more than one table, it's necessary to qualify the name with a table name to make it clear which column you mean. The separator characters are disallowed in database and table names because databases are represented on disk by directories, and tables are represented on disk by at least one file. These are capabilities found in some other databases but not in MySQL. Aliases are case sensitive. Manage Associations You can two tables together by defining a one-to-many or one-to-one relationship. Names can start with any character that is legal in a name, including a digit. Form Controls You can choose the form control such as checkbox, textbox, textarea which will be in the insert and update forms. This is useful when a name contains special characters or is a reserved word. If you use such a name, be particularly careful of names containing an 'E' or 'e' because those characters can lead to ambiguous expressions. For example, suppose you were allowed to use a slash in a table name on Windows. As a result, case sensitivity of database and table names depends on the way the operating system on that host treats filenames. The UNIX pathname separator is disallowed on Windows and vice versa to make it easier to transfer databases and tables between servers running on different platforms. As of MySQL 3. However, a name cannot consist entirely of digits because that would make it indistinguishable from a number. In this relationship, you define which foreign key links to which table and the column name which is used to display values while adding or editing that entity in a dropdown. It's necessary to qualify names only when a table or database cannot be determined from context. Names for databases, tables, columns, and indexes can be up to 64 characters long. If sampdb is the default database, the following statements are equivalent: A significant amount of progress has been made in improving MySQL since then, and those capabilities all have been added now. That would make it impossible to move the table to UNIX, because filenames on that platform cannot contain slashes. Aliases can be fairly arbitrary, but you should quote an alias within single or double quotes if it is a SQL keyword, is entirely numeric, or contains spaces or other special characters. Regardless of whether or not a database or table name is case sensitive on your system, you must refer to it using the same lettercase throughout a given query. That is not true for SQL keywords, function names, or column and index names, all of which can be referred to in varying lettercase style throughout a query. The form of names also depends on the context in which you use them. That's probably because for many or most applications, those features don't matter.
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