Table: `ndb.isometadata`#

Description#

No description available in database.

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: No description available

Statistics#

Metric	Value
Row Count	4,893
Total Size	536 kB
Table Size	408 kB
Indexes Size	128 kB

Relationships#

Primary Key: isometadataid

Foreign Keys:

analystid → contacts.contactid
dataid → data.dataid
isomatanaltypeid → isomaterialanalyzedtypes.isomatanaltypeid
isosubstratetypeid → isosubstratetypes.isosubstratetypeid

Referenced By:

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

Data Dictionary#

Column	Type	Nullable	Default	Constraints
`isometadataid`	integer	✗	`nextval('ndb.seq_isometadat...`	PRIMARY KEY
`dataid`	integer	✗	`-`	FOREIGN KEY
`isomatanaltypeid`	integer	✓	`-`	FOREIGN KEY
`isosubstratetypeid`	integer	✓	`-`	FOREIGN KEY
`analystid`	integer	✓	`-`	-
`lab`	character varying(255)	✓	`-`	-
`labnumber`	character varying(64)	✓	`-`	-
`mass_mg`	double precision	✓	`-`	-
`weightpercent`	double precision	✓	`-`	-
`atomicpercent`	double precision	✓	`-`	-
`reps`	integer	✓	`-`	-
`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 isometadata
SELECT *
FROM isometadata
ORDER BY isometadataid DESC
LIMIT 10;

Purpose: Retrieve the 10 most recent records from isometadata

Example 2: Count Records#

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

Purpose: Get the total number of records in isometadata

Example 3: Filter by Date Range#

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

Purpose: Retrieve records from isometadata within a specific date range

Example 4: Join with contacts#

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

Purpose: Retrieve isometadata records with related data from contacts

Example 5: Aggregate Data#

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

Purpose: Count records grouped by dataid

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.isometadata#