Type autocasting Number autocasting Symbol autocasting Type autocasting Crystal transparently casts elements of certain types when there is no ambiguity. Number autocasting ...

Type grammar Paths and generics Union Nilable Pointer StaticArray Tuple NamedTuple Proc self class Underscore typeof Type grammar When: specifying type restriction...

Type restrictions Restrictions from instance variables self restriction Classes as restrictions Type restrictions in splats Free variables Splat type restrictions Type res...

Type reflection Type reflection Crystal provides basic methods to do type reflection, casting and introspection.

Type restrictions Restrictions from instance variables self restriction Classes as restrictions Type restrictions in splats Free variables Splat type restrictions Type res...

Synopsis Description Parameters Examples Compatibility See Also Removes a data type. Synopsis DROP TYPE [ IF EXISTS ] <name> [, ...] [ CASCADE | RESTRICT ] ...

Synopsis Description Parameters Examples Compatibility See Also Removes a data type. Synopsis DROP TYPE [ IF EXISTS ] <name> [, ...] [ CASCADE | RESTRICT ] ...

Type inference With type restrictions Without type restrictions 1. Assigning a literal value 2. Assigning the result of invoking the class method new 3. Assigning a variable th...

Data Type Concept Node Group Tag Plugin Data Type Serial Port Baud Parity Stop Data Data Attribute Node Node Type Node CTL Node State Node Link State Plugin Kind ...

DROP TYPE 功能描述 注意事项 语法格式 参数说明 示例 相关链接 DROP TYPE 功能描述 删除一个用户定义的数据类型。 注意事项 类型的所有者或者被授予了类型DROP权限的用户或者被授予了DROP ANY TYPE权限的用户有权限执行DROP TYPE命令，系统管理员默认拥有此权限。 语法格式 DROP TYPE ...