要解决BigQuery、Amazon Athena和Presto中的分区和列的限制问题,可以使用以下方法:
CREATE TABLE my_table (
id INT64,
name STRING,
date DATE
)
PARTITION BY date;
INSERT INTO my_table (id, name, date)
VALUES
(1, 'John', DATE('2022-01-01')),
(2, 'Jane', DATE('2022-01-02')),
(3, 'Bob', DATE('2022-01-03'));
CREATE EXTERNAL TABLE my_table (
id INT,
name STRING
)
PARTITIONED BY (date STRING)
LOCATION 's3://my-bucket/my-folder/';
ALTER TABLE my_table ADD PARTITION (date='2022-01-01') LOCATION 's3://my-bucket/my-folder/date=2022-01-01/';
ALTER TABLE my_table ADD PARTITION (date='2022-01-02') LOCATION 's3://my-bucket/my-folder/date=2022-01-02/';
ALTER TABLE my_table ADD PARTITION (date='2022-01-03') LOCATION 's3://my-bucket/my-folder/date=2022-01-03/';
CREATE TABLE my_table (
id INT,
name VARCHAR,
date DATE
)
WITH (
partitioned_by = ARRAY['date']
);
INSERT INTO my_table (id, name, date)
VALUES
(1, 'John', DATE '2022-01-01'),
(2, 'Jane', DATE '2022-01-02'),
(3, 'Bob', DATE '2022-01-03');
以上示例代码展示了如何在BigQuery、Amazon Athena和Presto中使用分区和列限制。通过使用这些功能,可以更好地组织和查询数据,并提高查询性能。