如何让这个sql代码在谷歌大查询工作?

Question

此代码取自lucidchart，并希望在gbq中运行它以获取数据集信息。

SELECT 'mysql' dbms,t.TABLE_SCHEMA,t.TABLE_NAME,c.COLUMN_NAME,c.ORDINAL_POSITION,c.DATA_TYPE,c.CHARACTER_MAXIMUM_LENGTH,n.CONSTRAINT_TYPE,k.REFERENCED_TABLE_SCHEMA,k.REFERENCED_TABLE_NAME,k.REFERENCED_COLUMN_NAME FROM INFORMATION_SCHEMA.TABLES t LEFT JOIN INFORMATION_SCHEMA.COLUMNS c ON t.TABLE_SCHEMA=c.TABLE_SCHEMA AND t.TABLE_NAME=c.TABLE_NAME LEFT JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE k ON c.TABLE_SCHEMA=k.TABLE_SCHEMA AND c.TABLE_NAME=k.TABLE_NAME AND c.COLUMN_NAME=k.COLUMN_NAME LEFT JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS n ON k.CONSTRAINT_SCHEMA=n.CONSTRAINT_SCHEMA AND k.CONSTRAINT_NAME=n.CONSTRAINT_NAME AND k.TABLE_SCHEMA=n.TABLE_SCHEMA AND k.TABLE_NAME=n.TABLE_NAME WHERE t.TABLE_TYPE='BASE TABLE' AND t.TABLE_SCHEMA NOT IN('INFORMATION_SCHEMA','mysql','performance_schema');

错误信息是:表名"INFORMATION_SCHEMA.COLUMNS"在请求中没有设置默认数据集时丢失数据集。

Answer 1

正确的查询方法是在INFORMATION_SCHEMA.COLUMNS视图中添加前缀The dataset。文档

取自doc

的例子

SELECT
* EXCEPT(is_generated, generation_expression, is_stored, is_updatable)
FROM
`bigquery-public-data`.census_bureau_usa.INFORMATION_SCHEMA.COLUMNS
WHERE
table_name="population_by_zip_2010"