Table: `ndb.samplekeywords`#

Description#

This table lists the Sample Analysts.

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 lists the Sample Analysts.

Statistics#

Metric	Value
Row Count	19,012
Total Size	6584 kB
Table Size	992 kB
Indexes Size	5568 kB

Relationships#

Primary Key: sampleid, keywordid

Foreign Keys:

keywordid → keywords.keywordid
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
`sampleid`	integer	✗	`-`	FOREIGN KEY, PRIMARY KEY	Sample identification number. Field links to the Samples table.
`keywordid`	integer	✗	`-`	FOREIGN KEY, PRIMARY KEY	Keyword identification number. Field links to the Keywords lookup 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 samplekeywords
SELECT *
FROM samplekeywords
ORDER BY sampleid DESC
LIMIT 10;

Purpose: Retrieve the 10 most recent records from samplekeywords

Example 2: Count Records#

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

Purpose: Get the total number of records in samplekeywords

Example 3: Filter by Date Range#

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

Purpose: Retrieve records from samplekeywords within a specific date range

Example 4: Join with keywords#

-- Join with related table
SELECT 
    t1.*,
    t2.*
FROM samplekeywords t1
INNER JOIN keywords t2 
    ON t1.keywordid = t2.keywordid
LIMIT 100;

Purpose: Retrieve samplekeywords records with related data from keywords

Example 5: Aggregate Data#

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

Purpose: Count records grouped by keywordid

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

Data Quality Notes#

Automated Data Quality Tests#

This table is subject to the following automated quality checks:

✅ biz_001: modern_samples_have_recent_dates

Severity: WARNING
Status: PASSED
Description: Samples marked as modern should have dates after 1950

See the Data Quality Report for details.

Maintenance#

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

Table: ndb.samplekeywords#