Table: `ndb.collectors`#

Description#

The Collectors table lists the people who collected Collection Units.

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: The Collectors table lists the people who collected Collection Units.

Statistics#

Metric	Value
Row Count	53,263
Total Size	4376 kB
Table Size	3160 kB
Indexes Size	1192 kB

Relationships#

Primary Key: collectorid

Foreign Keys:

collectionunitid → collectionunits.collectionunitid
contactid → contacts.contactid

Referenced By:

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

Data Dictionary#

Column	Type	Nullable	Default	Constraints	Description
`collectorid`	integer	✗	`nextval('ndb.seq_collectors...`	PRIMARY KEY	An arbitrary Collector identification number.
`collectionunitid`	integer	✗	`-`	FOREIGN KEY	CollectionUnit collected. Field links to CollectionUnits table.
`contactid`	integer	✗	`-`	FOREIGN KEY	Person who collected the CollectionUnit. Multiple individuals are listed in separate records. Field links to the Contacts table.
`collectororder`	integer	✓	`-`	-	Order in which Collectors should be listed.
`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 collectors
SELECT *
FROM collectors
ORDER BY collectorid DESC
LIMIT 10;

Purpose: Retrieve the 10 most recent records from collectors

Example 2: Count Records#

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

Purpose: Get the total number of records in collectors

Example 3: Filter by Date Range#

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

Purpose: Retrieve records from collectors within a specific date range

Example 4: Join with collectionunits#

-- Join with related table
SELECT 
    t1.*,
    t2.*
FROM collectors t1
INNER JOIN collectionunits t2 
    ON t1.collectionunitid = t2.collectionunitid
LIMIT 100;

Purpose: Retrieve collectors records with related data from collectionunits

Example 5: Aggregate Data#

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

Purpose: Count records grouped by collectionunitid

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.collectors#