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Re: Query with 2 x subquery
Posted by: Jes Ramsing
Date: May 01, 2016 11:57PM

Hi Øystein.
I am on MySQL 5.6.27

data_i16:
CREATE TABLE `data_i16` (
`sessionid` bigint(20) NOT NULL,
`varid` int(11) NOT NULL,
`val` smallint(6) NOT NULL,
PRIMARY KEY (`varid`,`sessionid`),
KEY `ui16_idx` (`sessionid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

session:
CREATE TABLE `session` (
`sessionid` bigint(20) NOT NULL AUTO_INCREMENT,
`partid` int(11) NOT NULL,
`readsetid` int(11) NOT NULL,
`tsB` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
`tsE` timestamp NULL DEFAULT NULL,
PRIMARY KEY (`sessionid`),
KEY `Index 1` (`sessionid`)
) ENGINE=InnoDB AUTO_INCREMENT=1614938 DEFAULT CHARSET=utf8;

I have a lot of tables like data_i16 - each handling a specicic datatype. The database (solution) handles unstructured datasets captured from some various controllers. Performance is right now now fine except for this bloody query with double sub :-)

I did not know MySQL was operating out of Norway, I was at NTNU for some research two yeasrs ago, nice city but expensive beer.

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