![]() This write-up has demonstrated four different ways to check the data type of the table’s columns. The “\d” command and SELECT statement retrieve the data types of all columns. To check/find the data type of a particular column, use the information_schema or pg_typeof() function. In PostgreSQL, the SELECT statement, information_schema, \d command, and pg_typeof() function are used to check the data type of a column. The output proves that this time, the information schema retrieves the data type of only a specific column. The above query will retrieve the data type of the column named “bike_color”: To check the data type of only a specific column, you must specify the name of that particular column in the WHERE clause: SELECT column_name, data_type How to Check/Find the Type of a Particular Column? The output verifies that the information schema retrieves the column names and their respective data types for the bike_details table. The output verifhjjies that the information schema retrieves the column names and trespective data types of the bike_details table. How to Check/Find Column Types of a Table? The information_schema can be used to check the data type of a single or all columns. How to Check Column Type Using information_schema? The above snippet shows the data type of each column. The above query will fetch all the data of the bike_details table along with column types: How to Check Column Type Using SELECT Statement?Īnother very convenient way to retrieve column types is to execute the SELECT query from the pgAdmin: SELECT * FROM bike_details The “Type” column shows the data type of each column of the targeted table. How to Check Column Type Using \d Command?įrom SQL Shell, run the “\d” command followed by the table name to check the column types of a specific table: \d bike_details The output shows that the “ bike_launch_date” column has a “ TEXT” data type. Omitting the LIMIT clause will retrieve the data type as many times as the column values. In the above snippet, “LIMIT 1” is used to avoid fluff/repetition. ![]() Pg_typeof() is a built-in function in Postgres that can accept a column as an argument and retrieves the data type of the specified column: SELECT pg_typeof(bike_launch_date) How to Check Column Type Using pg_typeof() Function? How to Check Column Type Using information_schema?.Scale: Number of digits in terms of a fraction. Syntax: NUMERIC (precision, scale) Where, Precision: Total number of digits. Generally NUMERIC type are used for the monetary or amounts storage where precision is required. How to Check Column Type Using SELECT Statement? PostgreSQL supports the NUMERIC type for storing numbers with a very large number of digits.How to Check Column Type Using \d Command?.How to Check Column Type Using pg_typeof() Function?.In this regard, the below-listed concepts will be explained with practical examples: This blog post will teach you how to check the column type of a table in PostgreSQL. For example, the \d command, information_schema, pg_typeof() function, and SELECT query. In addition, some internally used or deprecated types are available, but are not listed here.PostgreSQL provides several ways to check the data type of the table’s columns. Most of the alternative names listed in the “Aliases” column are the names used internally by PostgreSQL for historical reasons. Table 8.1 shows all the built-in general-purpose data types. Users can add new types to PostgreSQL using the CREATE TYPE command. PostgreSQL has a rich set of native data types available to users. Composite Type Input and Output Syntax 8.17. Note that in addition to the below, enum and composite. Designing JSON documents effectively 8.14.3. The following lists the built-in mappings when reading and writing CLR types to PostgreSQL types.
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