Table: `ndb.siteimages`#

Description#

This table stores hyperlinks to jpeg images of sites.

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 hyperlinks to jpeg images of sites.

Statistics#

Metric	Value
Row Count	9
Total Size	48 kB
Table Size	8192 bytes
Indexes Size	32 kB

Relationships#

Primary Key: siteimageid

Foreign Keys:

contactid → contacts.contactid
siteid → sites.siteid

Referenced By:

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

Data Dictionary#

Column	Type	Nullable	Default	Constraints	Description
`siteimageid`	integer	✗	`nextval('ndb.seq_siteimages...`	PRIMARY KEY	An arbitrary Site Image identification number.
`siteid`	integer	✓	`-`	FOREIGN KEY	Site identification number. Field links to the Sites table.
`contactid`	integer	✓	`-`	FOREIGN KEY	Contact identification number for image attribution.
`caption`	text	✓	`-`	-	Caption for the image.
`credit`	character varying(255)	✓	`-`	-	Credit for the image. If null, the credit is formed from the ContactID.
`date`	date	✓	`-`	-	Date of photograph or image.
`siteimage`	text	✓	`-`	-	Hyperlink to a URL for the image.
`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 siteimages
SELECT *
FROM siteimages
ORDER BY siteimageid DESC
LIMIT 10;

Purpose: Retrieve the 10 most recent records from siteimages

Example 2: Count Records#

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

Purpose: Get the total number of records in siteimages

Example 3: Filter by Date Range#

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

Purpose: Retrieve records from siteimages within a specific date range

Example 4: Join with contacts#

-- Join with related table
SELECT 
    t1.*,
    t2.*
FROM siteimages t1
INNER JOIN contacts t2 
    ON t1.contactid = t2.contactid
LIMIT 100;

Purpose: Retrieve siteimages records with related data from contacts

Example 5: Aggregate Data#

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

Purpose: Count records grouped by siteid

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.siteimages#