SQL中有与PHP的microtime（）等效的东西吗？

Question

I assumed there would be a query you can make in SQL for this, microtime() is derived from the server environment so I hoped there would be a 'like-for-like' in SQL, but I can't see it. Im using MSSQL but would be interested in other dbs too.

Answer 1

Assuming MySQL, can you try something like this:

SELECT UNIX_TIMESTAMP();

Here is the SQL Fiddle which also shows the use of MySQLs MicroSecond method.

--EDIT

Since you're using SQL Server, can this work:

SELECT SYSDATETIME()

And the SQL Fiddle .

Answer 2

    select cast(datediff(second,'19700101',CURRENT_TIMESTAMP) as varchar)
+'.'+ cast(DATEPART(microsecond,CURRENT_TIMESTAMP) as varchar) 

Answer 3

As of MYSQL 5.6.4 to emulate microtime() you can use

select concat(mod(unix_timestamp(now(6)),1),'00 ',unix_timestamp());

and to emulate microtime(true)

select concat(unix_timestamp(now(6)),'00');

The ' 00 ' on both queries is there because MYSQL has a precision of only 6 digits. More info on https://dev.mysql.com/doc/refman/5.6/en/date-and-time-functions.html#function_now