在 MySQL 中如何比较时间戳日期和只有日期的参数？

在 SQL 语句中，如何将保存为 TIMESTAMP 的日期与 YYYY-MM-DD 格式的日期进行比较？

例句: SELECT * FROM table WHERE timestamp = '2012-05-25'

我希望此查询返回指定日期中具有时间戳的所有行，但它只返回具有午夜时间戳的行。

谢谢

246052 次浏览
小开
最佳答案

You can use the DATE() function to extract the date portion of the timestamp:

SELECT * FROM table
WHERE DATE(timestamp) = '2012-05-25'

Though, if you have an index on the timestamp column, this would be faster because it could utilize an index on the timestamp column if you have one:

SELECT * FROM table
WHERE timestamp BETWEEN '2012-05-25 00:00:00' AND '2012-05-25 23:59:59'
小开

Use a conversion function of MYSQL :

SELECT * FROM table WHERE DATE(timestamp) = '2012-05-05'

This should work

小开 
 WHERE cast(timestamp as date) = '2012-05-05'
小开 
SELECT * FROM table WHERE timestamp >= '2012-05-05 00:00:00'
AND timestamp <= '2012-05-05 23:59:59'
小开

In case you are using SQL parameters to run the query then this would be helpful

SELECT * FROM table WHERE timestamp between concat(date(?), ' ', '00:00:00') and concat(date(?), ' ', '23:59:59')
小开

Use 

SELECT * FROM table WHERE DATE(2012-05-05 00:00:00) = '2012-05-05'
小开

When I read your question, I thought your were on Oracle DB until I saw the tag 'MySQL'. Anyway, for people working with Oracle here is the way:

SELECT *
FROM table
where timestamp = to_timestamp('21.08.2017 09:31:57', 'dd-mm-yyyy hh24:mi:ss');
小开

As suggested by some, by using DATE(timestamp) you are applying manipulation to the column and therefore you cannot rely on the index ordering.

However, using BETWEEN would only be reliable if you include the milliseconds. In the example timestamp BETWEEN '2012-05-05 00:00:00' AND '2012-05-05 23:59:59' you exclude records with a timestamp between 2012-05-05 23:59:59.001 and 2012-05-05 23:59:59.999. However, even this method has some problems, because of the datatypes precision. Occasionally 999 milliseconds is rounded up.

The best thing to do is:

SELECT * FROM table
WHERE date>='2012-05-05' AND date<'2012-05-06'
小开

As I was researching this I thought it would be nice to modify the BETWEEN solution to show an example for a particular non-static/string date, but rather a variable date, or today's such as CURRENT_DATE(). This WILL use the index on the log_timestamp column.

SELECT *
FROM some_table
WHERE
log_timestamp
BETWEEN
timestamp(CURRENT_DATE())
AND # Adds 23.9999999 HRS of seconds to the current date
timestamp(DATE_ADD(CURRENT_DATE(), INTERVAL '86399.999999' SECOND_MICROSECOND));

I did the seconds/microseconds to avoid the 12AM case on the next day. However, you could also do `INTERVAL '1 DAY' via comparison operators for a more reader-friendly non-BETWEEN approach:

SELECT *
FROM some_table
WHERE
log_timestamp >= timestamp(CURRENT_DATE()) AND
log_timestamp < timestamp(DATE_ADD(CURRENT_DATE(), INTERVAL 1 DAY));

Both of these approaches will use the index and should perform MUCH faster. Both seem to be equally as fast.

小开 
SELECT * FROM table WHERE DATE(timestamp) = '2012-05-25'

It will work but not used index on "timestamp" column if you have any because of DATE function. below query used index and give better performance

SELECT * FROM table WHERE timestamp >= '2012-05-05 00:00:00'
AND timestamp <= '2012-05-05 23:59:59'

OR

SELECT * FROM table
WHERE timestamp >= '2012-05-05' AND timestamp < '2012-05-06'

Try running these to check stats

explain SELECT * FROM table
WHERE DATE(timestamp) = '2012-05-25'

explain SELECT * FROM table WHERE timestamp >= '2012-05-05 00:00:00'
AND timestamp <= '2012-05-05 23:59:59'
小开

Let me leave here it may help someone For people coming from nodejs and expressjs

  getDailyIssueOperations(dateName, date, status) {
const queryText = `
select count(*) as total from issues
where date(${dateName})='${date}' and status='${status}';
`;
},

in case date and column name are variables please find the implementation usefull


提交答案