CREATE TYPE 。。。 AS TABLE OF
时间: 2023-08-17 22:06:06 浏览: 51
`CREATE TYPE ... AS TABLE OF ...` 是一个Oracle数据库中创建表类型的语法,用于定义一个包含多行数据的类型。具体使用方法如下:
```
CREATE TYPE type_name AS TABLE OF datatype;
```
其中,`type_name` 是自定义类型的名称,`datatype` 是该类型中每行数据的数据类型。创建表类型后,可以在数据库中使用它来定义表的列、存储过程参数等。例如:
```
CREATE TYPE number_table_type AS TABLE OF NUMBER;
CREATE TABLE my_table (
id NUMBER,
numbers number_table_type
);
```
这样就创建了一个名为 `number_table_type` 的表类型,然后在 `my_table` 表中使用了这个类型来定义了一个 `numbers` 列。这个 `numbers` 列可以包含多行 `NUMBER` 数据。
在使用表类型时,可以使用 `CAST` 函数将其转换为一个表对象。例如:
```
SELECT CAST(number_table_type(1, 2, 3) AS number_table_type) FROM dual;
```
这个语句可以创建一个包含三个元素的 `number_table_type` 表类型,并将其作为结果集返回。
相关问题
create table
To create a table in a database, you can use the following SQL syntax:
```
CREATE TABLE table_name (
column1 datatype constraints,
column2 datatype constraints,
column3 datatype constraints,
...
);
```
Here's an example:
```
CREATE TABLE customers (
id INT PRIMARY KEY,
name VARCHAR(50),
email VARCHAR(50),
age INT
);
```
This creates a table called `customers` with four columns: `id`, `name`, `email`, and `age`. The `id` column is set as the primary key. The `name` and `email` columns are of type `VARCHAR` and have a maximum length of 50 characters. The `age` column is an integer.
CREATE TABLE
Sorry, as an AI language model, I am not currently able to create tables in a database. However, I can provide you with the syntax for creating a table in SQL:
CREATE TABLE table_name (
column1 datatype,
column2 datatype,
column3 datatype,
....
);
Replace "table_name" with the name you want to give to your table and "column1", "column2", etc. with the names of the columns you want to create, and "datatype" with the data type you want to assign to each column.