小编Rag*_*Pwn的帖子

我想确认哪个用户是HIVE中数据库的所有者.我在哪里可以找到这些信息？

我想获取具有最大SnapshotCreateTime的快照的SnapshotIdentifier，并通过ClusterIdentifier对其进行过滤。这是我正在使用的命令：

aws redshift describe-cluster-snapshots --region us-west-2 |
  jq -r '.Snapshots[]
         | select(.ClusterIdentifier == "dev-cluster")
         | max_by(.SnapshotCreateTime) 
         | .SnapshotIdentifier '

这是json

{
    "Snapshots": [        
        {
                "EstimatedSecondsToCompletion": 0, 
                "OwnerAccount": "45645641155", 
                "CurrentBackupRateInMegaBytesPerSecond": 6.2857, 
                "ActualIncrementalBackupSizeInMegaBytes": 22.0, 
                "NumberOfNodes": 3, 
                "Status": "available", 
                "VpcId": "myvpc", 
                "ClusterVersion": "1.0", 
                "Tags": [], 
                "MasterUsername": "ayxbizops", 
                "TotalBackupSizeInMegaBytes": 192959.0, 
                "DBName": "dev", 
                "BackupProgressInMegaBytes": 22.0, 
                "ClusterCreateTime": "2016-09-06T15:56:08.170Z", 
                "RestorableNodeTypes": [
                    "dc1.large"
                ], 
                "EncryptedWithHSM": false, 
                "ClusterIdentifier": "dev-cluster", 
                "SnapshotCreateTime": "2016-09-06T16:00:25.595Z", 
                "AvailabilityZone": "us-west-2c", 
                "NodeType": "dc1.large", 
                "Encrypted": false, 
                "ElapsedTimeInSeconds": 3, 
                "SnapshotType": "manual", 
                "Port": 5439, 
                "SnapshotIdentifier": "thismorning"
        }
    ]
}

我有一个返回时间戳数组的函数。我想将这些时间戳转换为 yyyy-mm-dd 格式的日期。我想展平返回的数组列，但我得到：

SQL compilation error: Unknown function FLATTEN

当我跑步时：

with cte as (SELECT 
    array_construct('2021-09-10'::date,'2021-09-11'::date,'2021-09-12'::date) AS array
    ,'2021-09-11'::date AS max_date
    ,date_filter
        (
          '2021-09-12'::date,
          array_construct('2021-09-10'::date,'2021-09-11'::date,'2021-09-12'::date)
          
        ) as dates )
        
        select flatten(cte.dates) from cte

功能是：

CREATE OR REPLACE FUNCTION date_filter (max_date DATE, date_list ARRAY)
  RETURNS ARRAY
  LANGUAGE JAVASCRIPT
  AS $$
  var dates = DATE_LIST;
  return  dates.filter(date => date < MAX_DATE);
  $$
  ;

我试图根据过去 18 个月内的访问次数将客户与“首选”商家联系起来，决胜局是最近的访问日期。我在决胜局方面遇到了一些麻烦。如果有两条记录根据某个 MemberID 的访问次数均排名第 1，我想将该 MemberID 的记录上的 IsFirst 位列设置为 1。我该怎么做呢？