PostgreSQL TO_NUMBER format as percentage.PostgreSQL TO_NUMBER format decimal places.PostgreSQL TO_NUMBER format with commas.PostgreSQL TO_NUMBER format thousand separator.PostgreSQL TO_NUMBER format signed integers.PostgreSQL TO_NUMBER format with leading zeros.In this tutorial, you have learned about the PostgreSQL NUMERIC data types and how to use NUMERIC column to store numbers. ORDER BY price DESC Code language: SQL (Structured Query Language) ( sql )Īs you can see from the output, the NaN is greater than 500.21 The following query sorts the products based on prices: SELECT * FROM products This implementation allows PostgreSQL to sort NUMERIC values and use them in tree-based indexes. However, two NaN values are equal and NaN is greater than other numbers. It means that the expression NaN = NaN returns false. Typically, the NaN is not equal to any number including itself. The following query returns the data of the products table: SELECT * FROM products Notice that you must use single quotes to wrap the NaN as shown in the UPDATE statement above. SET price = 'NaN' WHERE id = 1 Code language: SQL (Structured Query Language) ( sql ) The following example updates the price of the product id 1 to NaN : UPDATE products In addition to holding numeric values, the NUMERIC type can also hold a special value called NaN which stands for not-a-number. Code language: Shell Session ( shell ) PostgreSQL NUMERIC type and NaN PostgreSQL issued the following error: ERROR: numeric field overflowĭETAIL: A field with precision 5, scale 2 must round to an absolute value less than 10^3. VALUES( 'Phone', 123456.21) Code language: SQL (Structured Query Language) ( sql ) In case you store a value whose precision exceeds the declared precision, PostgreSQL will raise an error as shown in the following example: INSERT INTO products ( name, price) The following query returns all rows of the products table: SELECT * FROM products Code language: SQL (Structured Query Language) ( sql ) ( 'Tablet', 500.214) Code language: SQL (Structured Query Language) ( sql )īecause the scale of the price column is 2, PostgreSQL rounds the value 500.215 up to 500.22 and rounds the value 500.214 down to 500.21 : Second, insert some products with prices whose scales exceed the scale declared in the price column: INSERT INTO products ( name, price) ) Code language: SQL (Structured Query Language) ( sql ) If you store a value with a scale greater than the declared scale of the NUMERIC column, PostgreSQL will round the value to a specified number of fractional digits.įirst, create a new table named products for the demonstration: DROP TABLE IF EXISTS products Let’s take some example of using the PostgreSQL NUMERIC type. If precision is not required, you should not use the NUMERIC type because calculations on NUMERIC values are typically slower than integers, floats, and double precisions. In PostgreSQL, the NUMERIC and DECIMAL types are equivalent and both of them are also a part of SQL standard. NUMERIC Code language: SQL (Structured Query Language) ( sql ) If you omit both precision and scale, you can store any precision and scale up to the limit of the precision and scale mentioned above. The following shows the syntax of NUMERIC type with scale zero: NUMERIC(precision) Code language: SQL (Structured Query Language) ( sql ) The scale of the NUMERIC type can be zero or positive. The NUMERIC type can hold a value up to 131,072 digits before the decimal point 16,383 digits after the decimal point. For example, the number 1234.567 has the precision 7 and scale 3. In this syntax, the precision is the total number of digits and the scale is the number of digits in the fraction part. The following illustrate the syntax of the NUMERIC type: NUMERIC(precision, scale) Code language: SQL (Structured Query Language) ( sql ) Typically, you use the NUMERIC type for numbers that require exactness such as monetary amounts or quantities. The NUMERIC type can store numbers with a lot of digits. Introduction to PostgreSQL NUMERIC data type Summary: in this tutorial, you will learn about the PostgreSQL NUMERIC type for storing numeric data.
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