CREATE TABLE [IF NOT EXISTS] table_name( column_definition1, column_definition2, …….., table_constraints ); 也可简写为: CREATE TABLE table_name (column_name column_type); 上述语法的参数说明如下: 以下例子中我们将在 RUNOON 数据库中
TheDEFAULTclause specifies a default value for a column. With one exception, the default value must be a constant; it cannot be a function or an expression. This means, for example, that you cannot set the default for a date column to be the value of a function such asNOW()orCURRENT_...
普通租户(MySQL 模式) SQL 语句 CREATE EXTERNAL TABLE 更新时间:2025-05-07 10:06:48 描述 该语句用来在数据库中创建一张新的外表。 外表是数据库管理系统中的一项关键功能,通常数据库中的表存放于数据库的存储空间中,而外表的数据存储于外部存储服务中。
LIKE to create an empty table based on the definition of another table, including any column attributes and indexes defined in the original table: CREATE TABLE new_tbl LIKE orig_tbl; For more information, see Section 13.1.18.3, “CREATE TABLE ... LIKE Statement”. [AS] query_expression ...
普通租户(MySQL 模式) SQL 语句 CREATE TABLE 更新时间:2025-01-06 14:36:37 编辑 描述 该语句用来在数据库中创建一张新表。 语法 CREATE[TEMPORARY]TABLE[IFNOTEXISTS]table_name(table_definition_list)[table_option_list][partition_option][AS]select;CREATE[TEMPORARY]TABLE[IFNOTEXISTS]table_nameLIKEtable...
The CREATE TABLE statement is used to create a table in MySQL.We will create a table named "MyGuests", with five columns: "id", "firstname", "lastname", "email" and "reg_date":CREATE TABLE MyGuests ( id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY, firstname VARCHAR(30) NOT NULL,...
`update_date` datetime DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP COMMENT'更新时间', 这是建标语句。MySQL 5.5 每个表只允许一个列的默认值根据时间戳生成时间 可以使用触发器来替代一下: CREATE TABLE `example` ( `id` INTEGER UNSIGNED NOT NULL AUTO_INCREMENT, ...
Bug #87711 CREATE TABLE AS ... UNION fails with DATE column Submitted: 8 Sep 2017 15:08Modified: 19 Mar 2018 17:40 Reporter: Tim Mundt Email Updates: Status: Closed Impact on me: None Category: MySQL Server: DMLSeverity: S3 (Non-critical) Version: 5.7.17OS: Any Assigned to: ...
An AUTO_INCREMENT column cannot be used as a base column in a generated column definition. If expression evaluation causes truncation or provides incorrect input to a function, the CREATE TABLE statement terminates with an error and the DDL operation is rejected. If...
Above, Employee is the name of the table, and EmpId, FirstName, LastName, Email, PhoneNo, HireDate, and Salary are the columns.varchar is the string data type with size mentioned in the parenthesis e.g. varchar(20) specifies that the column will store a string upto 20 characters long....