Convert date format from "month_name day, year" to "yyyy-mm-dd" in BigQuery

Question

I have a column with date format as "month_name day, yyyy", for example, "July 4, 2000". Now I want to convert it to ISO "yyyy-mm-dd". Is there any function I can call to do it in standard SQL?

UPDATE target_name 
SET col = function(col)

How do I use python client to update a column with the above function or update a new column using the function after creating it as below ?

original_schema = table.schema
new_schema = original_schema[:] 
new_schema.append(bigquery.SchemaField('new_date', 'DATE'))
table.schema = new_schema
table = client.update_table(table, ['schema']) 

Thanks!

Answer 1

您可以使用日期函数： parse_date()将字符串转换为date ，然后format_date()将date转换为所需格式的字符串：

update target_name set col = format_date('%F', parse_date('%B %e, %Y', col))