sql - mysql select datetime query to find ids which are 1 year old, 2 year old and so on -


i want ids created in last 1 year, or year > 1 year < 2, , on. suppose if table: 

+----+--------------------------+---------------------+ | id | data                     | cur_timestamp       | +----+--------------------------+---------------------+ |  1 | time of creation is: | 2014-02-01 20:37:22 | |  2 | time of creation is: | 2015-01-01 20:37:22 | |  3 | time of creation is: | 2015-02-01 20:37:22 | |  4 | time of creation is: | 2015-12-01 20:37:22 | |  5 | time of creation is: | 2016-02-01 20:37:22 | |  6 | time of creation is: | 2016-04-01 20:37:22 | +----+--------------------------+---------------------+

i table this:

+-----------------------+-------+ | date range            | count | +-----------------------+-------+ | last 1 year           | 3     | | > 1 year & < 2 years  | 2     | | > 2 years             | 1     | +-----------------------+-------+

any content in first column fine. have count specified above. have tried various things. 

select count(*) ids cur_timestamp >= date_sub(now(), interval 1 year);

this give me count of ids in last 1 year. can extend other values. there way can values in 1 single query?

this called conditional aggregation. have add more conditions many years needed.

select  count(case when cur_timestamp >= date_sub(now(), interval 1 year) 1 end) last_1_yr, count(case when cur_timestamp > date_sub(now(), interval 1 year) , cur_timestamp <= date_sub(now(), interval 2 year) 1 end) bw_1_2_yrs, count(case when cur_timestamp > date_sub(now(), interval 2 year) 1 end) gt_2_yrs ids

Comments

Post a Comment

Popular posts from this blog

iOS: Performance of reloading UIImage(name:...) -

i have tableview , each row has icon. 90% of rows have same icon. in cellforrowatindexpath method load image assets folder this: var cellimage = uiimage(named: "myimage") does pose performance problem? os somehow smart enough it's same image each time? better if loaded image once , saved in class variable , assigned each time? uiimage 's named: api does kind of caching. if @ uiimage's documentation , states: use init(named:in:compatiblewith:) method (or init(named:) method) create image image asset or image file located in app’s main bundle (or other known bundle). because these methods cache image data automatically, recommended images use frequently.
Read more

How to prevent logback from emitting repeated "Empty watch file list. Disabling" messages -

i have logback configured logback.xml located here: http://pastebin.com/kuquekxy . every minute, see log message emitted of form: 18:26:21,486 |-info in reconfigureonchangetask(born:1478715201485) - empty watch file list. disabling why happening , how can rid of these? i can tell why happening, not how rid of them. the reconfigureonchangetask log line when doesn't have files watch. and doesn't have files watch because file in jar, , only watch files on filesystem . makes sense, because files within jar file don't change.
Read more

c# SetCompatibleTextRenderingDefault must be called before the first -

i tried search exception couldn't find solution on case i'am using code below invoke .net application : assembly assem = assembly.load(data); methodinfo method = assem.entrypoint; var o = activator.createinstance(method.declaringtype); method.invoke(o, null); the application invoked has form , in entrypoint of application : [stathread] static void main() { application.enablevisualstyles(); application.setcompatibletextrenderingdefault(false); //exception application.run(new form1()); } setcompatibletextrenderingdefault must called before first iwin32window object created in application. edit : assembly = assembly.load(data); methodinfo method = a.gettype().getmethod("start"); var o = activator.createinstance(method.declaringtype); method.invoke(o, null); you should create new method skips initialization...
Read more