# Description of Schema

## Tables
tableinfo
db
dbxref

### tableinfo | Top

Comments:
$Id: general.sql,v 1.31 2007-03-01 02:45:54 briano Exp $
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Chado general module
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TABLE: tableinfo
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NULL

Field Name | Data Type | Size | Default Value | Other | Foreign Key
--- | --- | --- | --- | --- | ---
tableinfo_id | integer | 11 |  | PRIMARY KEY, NOT NULL |
name | varchar | 30 |  | UNIQUE, NOT NULL |
primary_key_column | varchar | 30 | NULL |  |
is_view | integer | 10 | 0 | NOT NULL |
view_on_table_id | integer | 10 | NULL |  |
superclass_table_id | integer | 10 | NULL |  |
is_updateable | integer | 10 | 1 | NOT NULL |
modification_date | date | 0 | now() | NOT NULL |

### Constraints

Type | Fields
--- | ---
NOT NULL | tableinfo_id
NOT NULL | name
NOT NULL | is_view
NOT NULL | is_updateable
NOT NULL | modification_date
UNIQUE | name

### db | Top

Comments:
================================================
TABLE: db
================================================
A database authority. Typical databases in bioinformatics are FlyBase, GO, UniProt, NCBI, MGI, etc. The authority is generally known by this shortened form, which is unique within the bioinformatics and biomedical realm. To Do - add support for URIs, URNs (e.g. LSIDs). We can do this by treating the URL as a URI - however, some applications may expect this to be resolvable - to be decided.

Field Name | Data Type | Size | Default Value | Other | Foreign Key
--- | --- | --- | --- | --- | ---
db_id | integer | 11 |  | PRIMARY KEY, NOT NULL |
name | varchar | 255 |  | UNIQUE, NOT NULL |
description | varchar | 255 | NULL | contact_id bigint, |
urlprefix | varchar | 255 | NULL |  |
url | varchar | 255 | NULL |  |

### Constraints

Type | Fields
--- | ---
NOT NULL | db_id
NOT NULL | name
UNIQUE | name

### dbxref | Top

Comments:
================================================
TABLE: dbxref
================================================
A unique, global, public, stable identifier. Not necessarily an external reference - can reference data items inside the particular chado instance being used. Typically a row in a table can be uniquely identified with a primary identifier (called dbxref_id); a table may also have secondary identifiers (in a linking table _dbxref). A dbxref is generally written as : or as ::.

Field Name | Data Type | Size | Default Value | Other | Foreign Key
--- | --- | --- | --- | --- | ---
dbxref_id | integer | 11 |  | PRIMARY KEY, NOT NULL |
db_id | integer | 10 |  | UNIQUE, NOT NULL | db.db_id
accession | varchar | 255 |  | UNIQUE, NOT NULL, The local part of the identifier. Guaranteed by the db authority to be unique for that db. |
version | varchar | 255 |  | UNIQUE, NOT NULL |
description | text | 64000 |  |  |

### Indices

Name | Fields
--- | ---
dbxref_idx1 | db_id
dbxref_idx2 | accession
dbxref_idx3 | version

### Constraints

Type | Fields
--- | ---
NOT NULL | dbxref_id
NOT NULL | db_id
FOREIGN KEY | db_id
NOT NULL | accession
NOT NULL | version
UNIQUE | db_id, accession, version

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