[docs](ddl) add docs for generated column #715
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feiniaofeiafei
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Please add En docs |
shasevendow
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Jun 21, 2024
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Waiting for apache/doris#35284 merged. |
morrySnow
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This pr has added support for generated columns. Values of a generated
column are computed from an expression included in the column
definition. Here is an example:
mysql> CREATE TABLE products (
product_id INT,
price DECIMAL(10,2),
quantity INT,
total_value DECIMAL(10,2) GENERATED ALWAYS AS (price * quantity)
) DISTRIBUTED BY HASH(product_id) PROPERTIES ("replication_num" = "1");
mysql> insert into products values(1, 10.00, 10, default);
mysql> insert into products(product_id, price, quantity) values(1, 20.00, 10);
mysql> select * from products;
+------------+-------+----------+-------------+
| product_id | price | quantity | total_value |
+------------+-------+----------+-------------+
| 1 | 10.00 | 10 | 100.00 |
| 1 | 20.00 | 10 | 200.00 |
+------------+-------+----------+-------------+
related docs in apache/doris-website#715
---------
Co-authored-by: feiniaofeiafei <moailing@selectdb.com>
dataroaring
pushed a commit
to apache/doris
that referenced
this pull request
Jun 26, 2024
This pr has added support for generated columns. Values of a generated
column are computed from an expression included in the column
definition. Here is an example:
mysql> CREATE TABLE products (
product_id INT,
price DECIMAL(10,2),
quantity INT,
total_value DECIMAL(10,2) GENERATED ALWAYS AS (price * quantity)
) DISTRIBUTED BY HASH(product_id) PROPERTIES ("replication_num" = "1");
mysql> insert into products values(1, 10.00, 10, default);
mysql> insert into products(product_id, price, quantity) values(1, 20.00, 10);
mysql> select * from products;
+------------+-------+----------+-------------+
| product_id | price | quantity | total_value |
+------------+-------+----------+-------------+
| 1 | 10.00 | 10 | 100.00 |
| 1 | 20.00 | 10 | 200.00 |
+------------+-------+----------+-------------+
related docs in apache/doris-website#715
---------
Co-authored-by: feiniaofeiafei <moailing@selectdb.com>
morrySnow
reviewed
Jun 27, 2024
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| ## ALTER TABLE和生成列 | ||
| 生成列暂时不支持ADD COLUMN, MODIFY COLUMN。 |
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这里有点儿简略。可能会被误会为有生成列的表，都不能添加列和修改列
morrySnow
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Jul 9, 2024
feiniaofeiafei
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related code in apache/doris#35284