在BigQuery中搜索日期

Question

我有一个存储在BigQuery中的日期字段。我想搜索匹配的月份或年份或整个日期。什么是执行以下操作的最高性能方法？

# An example date looks like "2014-01-01" 

# By year 
SELECT * FROM index WHERE date LIKE '2014-%' 

# By month 
SELECT * FROM index WHERE date LIKE '%-01-%' 

# By day 
SELECT * FROM index WHERE date LIKE '%-\d\d-01' 

# By year and month 
SELECT * FROM index WHERE date LIKE '2014-01-%' 

我该如何在BigQuery中以最高性能的方式进行上述搜索？

注意，上述字段的类型为DATE。

Answer 1

为BigQuery的标准SQL，并假设日期字段存储为DATE类型

截至

#standardSQL 
SELECT * FROM index WHERE EXTRACT(YEAR FROM dt) = 2014 

按月份

#standardSQL 
SELECT * FROM index WHERE EXTRACT(MONTH FROM dt) = 1 

白天

#standardSQL 
SELECT * FROM index WHERE EXTRACT(DAY FROM dt) = 1