![]() ![]() CREATE DATABASE testDB Tip: Make sure you have admin privilege before creating any database. When identifiers are used in Transact-SQL statements, the identifiers that do not comply with these rules must be delimited by double quotation marks or brackets. Hyphens are a big problem because if you end up mapping a column name to a variable, most languages do not like to have hyphens inside variable names. The CREATE DATABASE statement is used to create a new SQL database. Supplementary characters are not allowed. When a MySQL installation is upgraded to MySQL 5.1 or later from an older version,the server displays a name such as a-b-c (which is in the old format) as mysql50a-b-c, and you must refer to the name using the mysql50. SQL Server reserves both the uppercase and lowercase versions of reserved words.Įmbedded spaces or special characters are not allowed. In MySQL 5.1 and later, the same database name is encoded as a002db002dc to produce a file system-neutral directory name. The identifier must not be a Transact-SQL reserved word. The at sign, dollar sign ($), number sign, or underscore. The query to create a table is as follows. Using BIGINT will save you 3 bytes per row over VARCHAR(10). You can use a BIGINT instead of INT to store it as a numeric. The maximum value for an INT in MySQL is 2147483647 (or 4294967295 if unsigned). Let us see the same while creating a table. In MySQL -> INT(10) does not mean a 10-digit number, it means an integer with a display width of 10 digits. Here is the demo that does not have any issue with underscore with table names. You will get the issues with a dash in a MySQL table name. Letters as defined in the Unicode Standard 3.2.ĭecimal numbers from either Basic Latin or other national scripts. No, you won’t get any issues with underscores in a MySQL table name. CREATE DATABASE testDB Tip: Make sure you have admin privilege before creating any database. Some Transact-SQL functions have names that start with double at signs To avoid confusion with these functions, you should not use names that start with characters can include the following: Although the number sign or double number sign characters can be used to begin the names of other types of objects, we do not recommend this practice. An identifier that starts with double number signs (#) denotes a global temporary object. An identifier that starts with a number sign denotes a temporary table or procedure. A regular identifier that starts with the at sign always denotes a local variable or parameter and cannot be used as the name of any other type of object. The underscore (_), at sign or number sign (#).Ĭertain symbols at the beginning of an identifier have special meaning in SQL Server. The Unicode definition of letters includes Latin characters from a through z, from A through Z, and also letter characters from other languages. The first character must be one of the following:Ī letter as defined by the Unicode Standard 3.2. When the compatibility level is 100, the following rules apply: This level can be set by using ALTER DATABASE. The rules for the format of regular identifiers depend on the database compatibility level. ![]()
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