Columns of derived tables that name has been given by the system (2)

Query goal:

Find columns of derived tables (i.e., views and materialized views) where in the creation statement of the table the name of the column has not been specified, i.e., it is generated by the system.

Notes about the query:

The query looks the source to find a pattern where a function has been used in the SELECT clause but the resulting column name has probably been system-defined. The query considers only some of the most popular functions.

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

Data source:

system catalog only

SQL query:

Click on query to copy it

WITH derived_tables AS (
SELECT 
c.oid,
n.nspname AS schema_name,
c.relname AS table_name,
CASE WHEN c.relkind='v' THEN 'VIEW'
WHEN c.relkind='m' THEN 'MATERIALIZED VIEW' END AS table_type,
regexp_replace(pg_get_viewdef(c.oid),'[\r\n]','<br>','g') AS view_src,
pg_get_viewdef(c.oid) AS view_src_original
FROM pg_attribute at INNER JOIN pg_class c ON at.attrelid=c.oid
INNER JOIN pg_namespace AS n ON n.oid=c.relnamespace
INNER JOIN pg_authid AS a ON n.nspowner=a.oid
WHERE (nspname='public' OR rolname<>'postgres')
AND c.relkind IN ('v','m')
AND at.attisdropped='f'
AND at.attnum>0
)
SELECT schema_name, table_name, table_type, view_src
FROM derived_tables
WHERE view_src_original~*'localtimestamp[^,]*[[:space:]]+AS[[:space:]]+"localtimestamp'
OR view_src_original~*'curren_timestamp[^,]*[[:space:]]+AS[[:space:]]+"current_timestamp'
OR view_src_original~*'now[^,]*[[:space:]]+AS[[:space:]]+"now'
OR view_src_original~*'min[^,]*[[:space:]]+AS[[:space:]]+"min'
OR view_src_original~*'max[^,]*[[:space:]]+AS[[:space:]]+"max'
OR view_src_original~*'count[^,]*[[:space:]]+AS[[:space:]]+"count'
OR view_src_original~*'sum[^,]*[[:space:]]+AS[[:space:]]+"sum'
OR view_src_original~*'avg[^,]*[[:space:]]+AS[[:space:]]+"avg'
OR view_src_original~*'upper[^,]*[[:space:]]+AS[[:space:]]+"upper'
OR view_src_original~*'lower[^,]*[[:space:]]+AS[[:space:]]+"lower'
ORDER BY schema_name, table_name;

Collections where the query belongs to

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 .

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 .

Categories where the query belongs to

Category name	Category description
Comfortability of data management	Queries of this category provide information about the means that have been used to make the use or management of database more comfortable and thus, more efficient.
Derived tables	Queries of this category provide information about the derived tables (views, materialized views), which are used to implement virtual data layer.
Naming	Queries of this category provide information about the style of naming.

Category name

Category description

Comfortability of data management

Queries of this category provide information about the means that have been used to make the use or management of database more comfortable and thus, more efficient.

Derived tables

Queries of this category provide information about the derived tables (views, materialized views), which are used to implement virtual data layer.

Naming

Queries of this category provide information about the style of naming.