user-variables

I have a table consisting of groups of, for example, five rows each. Each row in each group possesses a date value unique to that group. What I want to do in my query, is go through the table, and increment a user variable (@count) when this date value changes. That's to say, @count should equal the group count, rather than the row count. My current query looks like this, in case you're wondering: SELECT @row := @row +1 AS rownum, date FROM ( SELECT @row := 0 ) r, stats Thanks a lot. What about something like this? SELECT (CASE WHEN @date <> date THEN @row := @row +1 ELSE @row END) AS rownum,

Using user variables to number rows I often find answers here on SO suggesting the use of user variables to number some thing or other. Perhaps the clearest example would be a query to select every second row from a given result set. (This question and query is similar to this answer , but it was this answer which actually triggered this question here). SELECT * FROM (SELECT *, (@row := @row + 1) AS rownum FROM (SELECT @row := 0) AS init, tablename ORDER BY tablename.ordercol ) sub WHERE rownum % 2 = 1 This approach does seem to usually work. Reasons to be careful On the other hand, the MySQ

I get a list of suburbs within a specified distance from a single location using Queries A . I’m trying to adapt Queries A to get a list of suburbs surrounding location1, then get list of suburbs surrounding location2 and so on (I'll call this Queries B ). Essentially Queries B is doing the same as Queries A, but repeating it for each separate location. My question- how can I do this using MySQL only. Suggestions on how to do this are much appreciated. Here is a sample of the data I am working with. SqlFiddle here CREATE TABLE `geoname` ( `geonameid` INT(11) NOT NULL, `asciiname` VARCHAR(200)