To begin finding information about the tables in the system, you can simply return columns from PG_TABLE_DEF: SELECT * FROM PG_TABLE_DEF; For better or worse, PG_TABLE_DEF contains information about everything in the system, so the results of such an open query will be massive, but sho...
当您查询 PREDICATE_COLUMNS 视图时,如下例中所示,可以看到 LISTID、EVENTID 和 LISTTIME 标记为谓词列。 select * from predicate_columns where table_name = 'listing'; schema_name | table_name | col_num | col_name | is_predicate | first_predicate_use | last_analyze ---+---+---+---+-...
If the table uses a compound sort key, then all columns that are part of the sort key have a positive value that indicates the position of the column in the sort key. If the table uses an interleaved sort key, then each column that is part of the sort key has a value that is alte...
但表达式的类型为 character varying”异常，源postgresql中id字段是uuid类型，但是经过kettle后却变成了stri...
Set the structure property: Columns that define the structure of the dataset. AmazonRedshiftTableDataset withTable(Object table) Set the table property: The Amazon Redshift table name. AmazonRedshiftTableDataset withTableName(Object tableName) Set the tableName property: This property wi...
UNLOAD ('${deduplication_select_sql}') TO 's3://seals-lf-normalized-data-lake-${env}/temp/${table_name}/' iam_role 'arn:aws:iam::{420302173806/851474929481}:role/DEVELOPER' FORMAT AS PARQUET PARTITION BY (${partition_columns});
// aws-redshift-alpha/lib/private/database-query-provider/table.tsif((!oldDistKey&&newDistKey)||(oldDistKey&&!newDistKey)){returncreateTable(tableNamePrefix,tableNameSuffix,tableColumns,tableAndClusterProps);}elseif(oldDistKey!==newDistKey){alterationStatements.push(`ALTER TABLE${tableName}ALTER DI...
问使用Pandas从Redshift中读取bigint (int8)列数据EN这保留了大整数的确切值，并允许使用NaN值。但是，...
In addition to its PostgreSQL roots, a key feature of AWS Redshift is its columnar data storage. This approach to data storage is particularly efficient for analytics, as it allows for faster retrieval of specific columns, optimizing the performance for query-heavy workloads typically associated ...
要查看有关键分配偏斜和上次重建索引时间的信息,请查询SVV_INTERLEAVED_COLUMNS 系统视图。 三、实验 接下来,我们将做几个实验来验证此前的理论,实验所用的集群硬件为2台dc1.large实例。请注意实验的数据集不同,硬件条件不同,查询语句不同,实验结果自然也会有所不同,但是我们可以从实验中尝试总结出一些规律,以便在...