Table: `ndb.aggregatesamples`#

Description#

This table stores the samples in Aggregate Datasets.

TODO: Expand this description with: - What data does this table store? - What is the business/research purpose? - How is this data collected or generated? - Are there any important caveats or data quality issues?

Table Structure#

Schema: ndb | Table Comment: This table stores the samples in Aggregate Datasets.

Statistics#

Metric	Value
Row Count	5,001
Total Size	416 kB
Table Size	256 kB
Indexes Size	128 kB

Relationships#

Primary Key: aggregatedatasetid, sampleid

Foreign Keys:

aggregatedatasetid → aggregatedatasets.aggregatedatasetid
sampleid → samples.sampleid

Referenced By:

TODO: Document which tables reference this table (will be auto-detected in validation).

Data Dictionary#

Column	Type	Nullable	Default	Constraints	Description
`aggregatedatasetid`	integer	✗	`-`	PRIMARY KEY, FOREIGN KEY	An arbitrary Aggregate Dataset identification number. Field links to the AggregateDatasets table.

`sampleid`	integer	✗	`-`	PRIMARY KEY, FOREIGN KEY	Sample ID number. Field links to the Samples table.
`recdatecreated`	timestamp without time zone	✗	`timezone('UTC'::text, now())`	-
`recdatemodified`	timestamp without time zone	✗	`-`	-

TODO: Review column descriptions and add comments where missing.

Usage Examples#

Example 1: Basic Selection#

-- Get recent records from aggregatesamples
SELECT *
FROM aggregatesamples
ORDER BY aggregatedatasetid DESC
LIMIT 10;

Purpose: Retrieve the 10 most recent records from aggregatesamples

Example 2: Count Records#

-- Count total records
SELECT COUNT(*) as total_records
FROM aggregatesamples;

Purpose: Get the total number of records in aggregatesamples

Example 3: Filter by Date Range#

-- Get records within a date range
SELECT *
FROM aggregatesamples
WHERE recdatecreated >= '2024-01-01'
  AND recdatecreated < '2025-01-01'
ORDER BY recdatecreated DESC;

Purpose: Retrieve records from aggregatesamples within a specific date range

Example 4: Join with aggregatedatasets#

-- Join with related table
SELECT 
    t1.*,
    t2.*
FROM aggregatesamples t1
INNER JOIN aggregatedatasets t2 
    ON t1.aggregatedatasetid = t2.aggregatedatasetid
LIMIT 100;

Purpose: Retrieve aggregatesamples records with related data from aggregatedatasets

Example 5: Aggregate Data#

-- Aggregate records by sampleid
SELECT 
    sampleid,
    COUNT(*) as count
FROM aggregatesamples
GROUP BY sampleid
ORDER BY count DESC
LIMIT 10;

Purpose: Count records grouped by sampleid

TODO: Add more specific examples relevant to common research questions or operational tasks.

Data Quality Notes#

TODO: Document: - Known data quality issues - Validation rules - Expected data ranges - Update frequency and mechanisms - Any ETL processes that populate this table

Maintenance#

Data Owner: TODO: Assign owner
Update Frequency: TODO: Document frequency
Last Major Schema Change: TODO: Document when schema last changed

Table: ndb.aggregatesamples#