Query goal: | Find all primary key and unique constraints of base tables that involve at least one column with personal names. Personal names are not unique and these cannot be (usually) used to guarantee uniqueness. Either one has declared a superkey instead of candidate key (i.e., the key contains a column that is not needed for uniqueness) or the key columns have been found incorrectly. |
Notes about the query: | The query finds columns that contain personal names based on column names. Thus, there can be false positive and false negative results. |
Query type: | Problem detection (Each row in the result could represent a flaw in the design) |
Query reliability: | Medium (Medium number of false-positive results) |
Query license: | MIT License |
Fixing suggestion: | Declare a correct key that has a) uniqueness property - in case of each row its value is unique and b) irreducibility property - if one removes any column from the key, then it stops being unique. |
Data source: | system catalog only |
SQL query: | Click on query to copy it
with keys as (select o.conname, (select nspname from pg_namespace where oid=c.relnamespace) as key_schema, c.relname as key_table, c.oid as key_table_oid, o.conkey AS key_col, case when o.contype='p' then 'PRIMARY KEY' ELSE 'UNIQUE' END as contype from pg_constraint o inner join pg_class c on c.oid = o.conrelid where o.contype in ('u', 'p') ), keys_unnest as (select conname, key_schema, key_table, key_table_oid, key_col, key_col_num, ordin, contype from keys, unnest(keys.key_col) with ordinality as k(key_col_num, ordin)), keys_with_names as (select conname, key_schema, key_table, contype, string_agg(a_key.attname, ', ' order by ordin) as key_col from keys_unnest k inner join pg_attribute a_key on k.key_col_num = a_key.attnum and k.key_table_oid = a_key.attrelid and a_key.attisdropped = false group by conname, key_schema, key_table, contype) select conname, key_schema, key_table, contype, key_col from keys_with_names where key_col~*'(first[_]*name|last[_]*name|given[_]*name|surname|person[_]*name|eesnimi|perenimi|perekonnanimi|isik.*nimi)' order by key_schema, key_table, contype, key_col; |
Collection name | Collection description |
---|---|
Find problems automatically | Queries, that results point to problems in the database. Each query in the collection produces an initial assessment. However, a human reviewer has the final say as to whether there is a problem or not . |
Category name | Category description |
---|---|
Naming | Queries of this category provide information about the style of naming. |
Uniqueness | Queries of this category provide information about uniqueness constraints (PRIMARY KEY, UNIQUE, EXCLUDE) as well as unique indexes. |
Validity and completeness | Queries of this category provide information about whether database design represents the world (domain) correctly (validity) and whether database design captures all the information about the world (domain) that is correct and relevant (completeness). |