Format a number to have commas (1000000 -> 1,000,000) - google-bigquery

Question

In Bigquery: How do we format a number that will be part of the resultset to have it formatted with commas: like 1000000 to 1,000,000 ?

Answer 1

below is for Standard SQL
SELECT
input,
FORMAT("%'d", input) as formatted
FROM (
SELECT 123 AS input UNION ALL
SELECT 1234 AS input UNION ALL
SELECT 12345 AS input UNION ALL
SELECT 123456 AS input UNION ALL
SELECT 1234567 AS input UNION ALL
SELECT 12345678 AS input UNION ALL
SELECT 123456789 AS input
)
Works great for integers, but if you will need floats too, you can use :
SELECT
input,
CONCAT(FORMAT("%'d", CAST(input AS int64)),
SUBSTR(FORMAT("%.2f", CAST(input AS float64)), -3)) as formatted
FROM (
SELECT 123 AS input UNION ALL
SELECT 1234 AS input UNION ALL
SELECT 12345 AS input UNION ALL
SELECT 123456.1 AS input UNION ALL
SELECT 1234567.12 AS input UNION ALL
SELECT 12345678.123 AS input UNION ALL
SELECT 123456789.1234 AS input
)
added for Legacy SQL
Btw, if for whatever reason you are bound to Legacy SQL - below is quick example for it
SELECT input, formatted
FROM JS((
SELECT input
FROM
(SELECT 123 AS input ),
(SELECT 1234 AS input ),
(SELECT 12345 AS input ),
(SELECT 123456 AS input ),
(SELECT 1234567 AS input ),
(SELECT 12345678 AS input ),
(SELECT 123456789 AS input)
),
// input
input,
// output
"[
{name: 'input', type:'integer'},
{name: 'formatted', type:'string'}
]",
// function
"function (r, emit) {
emit({
input: r.input,
formatted: r.input.toString().replace(/(\d)(?=(\d{3})+(?!\d))/g, '$1,')
});
}"
)
Above example uses in-line versin of Legacy SQL User-Defined Functions which is usually used for quick demo/example - but not recommended in production - if you will find it useful for you - you will need to "very slightly" transform it - see https://cloud.google.com/bigquery/user-defined-functions#webui for example

Answer 2

With Standard SQL:
SELECT FORMAT("%'d", 1000123)
1,000,123
Instruction to enable Standard SQL: https://cloud.google.com/bigquery/sql-reference/enabling-standard-sql

Answer 3

Improve on Mikhail's answer for the float session
CAST(input AS int64) will make numbers like 12345.5 become 12346.50 in output.
I will use split by "." to get the integer part of the number, then cast to int64.
CREATE TEMP FUNCTION
format_n(x float64) AS (CONCAT(FORMAT("%'d", CAST(SPLIT(CAST(x AS string), '.')[
OFFSET
(0)] AS int64)),SUBSTR(FORMAT("%.2f", x), -3)));
SELECT
input,
format_n(input)
FROM (
SELECT
123 AS input
UNION ALL
SELECT
1234 AS input
UNION ALL
SELECT
12345 AS input
UNION ALL
SELECT
123456.8 AS input
UNION ALL
SELECT
1234567.12 AS input
UNION ALL
SELECT
12345678.127 AS input
UNION ALL
SELECT
123456789.1234 AS input )