Find base table columns with a timestamp type and a simple check constraint that checks as to whether the timestamp values are within an appropriate range of values. Find constraints where the check of the upper bound of the range is perhaps incorrect.
Type
Problem detection (Each row in the result could represent a flaw in the design)
If one has to check that values in the column reg_time are between years 2010 and 2100, one should have CHECK (reg_time>='2010-01-01' AND reg_time<'2101-01-01') instead of checks like CHECK (reg_time>='2010-01-01' AND reg_time<='2100-12-31') or instead of CHECK (reg_time>='2010-01-01' AND reg_time<='2100-12-31 23:59:49') or CHECK (reg_time BETWEEN '2010-01-01' AND '2100-12-31 23:59'). The latter checks would omit some moments from the permitted range.
Data Source
INFORMATION_SCHEMA+system catalog
SQL Query
WITH domains AS (
SELECT cdu.table_schema, cdu.table_name, cdu.column_name, (SELECT data_type FROM INFORMATION_SCHEMA.domains AS d
WHERE d.domain_schema=dc.domain_schema AND d.domain_name=dc.domain_name) AS data_type, cc.check_clause
FROM ((INFORMATION_SCHEMA.column_domain_usage AS cdu INNER JOIN
INFORMATION_SCHEMA.tables AS t USING (table_schema, table_name)) INNER JOIN INFORMATION_SCHEMA.domain_constraints AS dc
USING (domain_schema, domain_name)) INNER JOIN INFORMATION_SCHEMA.check_constraints AS cc
USING (constraint_catalog, constraint_schema, constraint_name)
WHERE t.table_type='BASE TABLE' AND cc.check_clause NOT LIKE '%IS NOT NULL' AND
cdu.table_schema NOT IN (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name<>'public' AND
schema_owner='postgres' AND catalog_name IS NOT NULL AND schema_name IS NOT NULL)),
temp_domains AS (SELECT table_schema, table_name, column_name, data_type, check_clause
FROM domains
WHERE data_type IN ('timestamp with time zone','timestamp without time zone')),
temp_simple_chk AS (SELECT
(SELECT nspname FROM pg_namespace WHERE oid=c.relnamespace) AS table_schema,
c.relname as table_name,
a.attname AS column_name,
t.typname AS data_type,
regexp_replace(pg_get_constraintdef(o.oid),'^CHECK ','','i') AS check_clause
FROM pg_constraint o INNER JOIN pg_class c ON c.oid = o.conrelid
INNER JOIN pg_attribute a ON a.attrelid = c.oid AND a.attnum = o.conkey[1] AND a.attisdropped = FALSE
INNER JOIN pg_type t ON a.atttypid=t.oid
WHERE cardinality(o.conkey)=1 AND o.contype = 'c' AND t.typname IN ('timestamp', 'timestamptz')
UNION SELECT table_schema, table_name, column_name, data_type, check_clause
FROM temp_domains)
SELECT table_schema, table_name, column_name, data_type, check_clause
FROM temp_simple_chk
WHERE check_clause~*'([[:space:]]between[[:space:]].+[[:space:]]and|[[:space:]]>=[[:space:]].+[[:space:]]and[[:space:]].+<=)'
ORDER BY table_schema, table_name, column_name;
Collections
This query belongs to the following collections:
Name
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 .
Categories
This query is classified under the following categories:
Name
Description
CHECK constraints
Queries of this category provide information about CHECK constraints.
Temporal data
Queries of this category provide information about temporal (time-related) data that is kept in the database.