| Query goal: | Find base table columns that name refers to the possibility that these are used to register XML/JSON values. Find the columns that do not have an appropriate data type (xml, json, jsonb). One shouldn't use columns with a textual type to register such data. |
| Query type: | Problem detection (Each row in the result could represent a flaw in the design) |
| Query reliability: | Low (Many false-positive results) |
| Query license: | MIT License |
| Fixing suggestion: | Change the type of the column or rename the column. PostgreSQL provides both XML and JSON type. |
| Data source: | INFORMATION_SCHEMA only |
| SQL query: | Click on query to copy it
SELECT table_schema, table_name, column_name, data_type, character_maximum_length FROM INFORMATION_SCHEMA.columns WHERE column_name !~* 'name' AND (character_maximum_length IS NULL OR character_maximum_length>=1000) AND ((column_name ~* 'xml' AND data_type<>'xml') OR (column_name ~* 'json' AND data_type NOT IN ('json','jsonb'))) AND (table_schema, table_name) IN (SELECT table_schema, table_name FROM INFORMATION_SCHEMA.tables WHERE table_type='BASE TABLE') AND table_schema NOT IN (SELECT schema_name FROM INFORMATION_SCHEMA.schemata WHERE schema_name<>'public' AND schema_owner='postgres' AND schema_name IS NOT NULL) ORDER BY table_schema, table_name, ordinal_position; |
| Collection name | Collection description |
|---|---|
| Find problems about base tables | A selection of queries that return information about the data types, field sizes, default values as well as general structure of base tables. Contains all the types of queries - problem detection, software measure, and general overview |
| 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 |
|---|---|
| Comfortability of database evolution | Queries of this category provide information about the means that influence database evolution. |
| Data types | Queries of this category provide information about the data types and their usage. |
| Naming | Queries of this category provide information about the style of naming. |
| Result quality depends on names | Queries of this category use names (for instance, column names) to try to guess the meaning of a database object. Thus, the goodness of names determines the number of false positive and false negative results. |
| 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). |