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SQL - select surrounding records of the one fulfil a condition

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0

I have the following table:

epochTime,id,counter1,value
123,Alpha,2,2
124,Beta,0,3
135,Alpha,0,1
112,Alpha,0,5
150,Alpha,0,-1
225,Beta,1,2
228,Beta,1,0
300,Beta,0,2

I want to select all records with counter1 > 0 and the record after that, partitioning by id and order by epochTime (the requirement similar to Unix "grep -A 1" command)
So the expected result from the data above would be

epochTime id counter1 value
 123 Alpha 2 2
 135 Alpha 0 1
 225 Beta 1 2
 228 Beta 1 0
 300 Beta 0 2

I am using AWS Athena, and got the following query, which works as expected.

SELECT * FROM (
 SELECT id,
 epochTime,
 counter1,
 value,
 first_value(counter1) OVER (
 PARTITION BY id
 ORDER BY epochTime
 ROWS BETWEEN 1 PRECEDING AND CURRENT ROW
 ) AS preCounter
 FROM testsql
) WHERE counter1 > 0 OR preCounter > 0 

However, I see two problems with the query:

• It is a nested query


• 
  

  I needed to create a dummy column (preCounter). If the requirements on the WHERE condition become more complex (i.e: conditions on multiple columns), I would need to create multiple dummy columns

  
  
  
  1. Are there better solutions (better performance, simpler query, ...) for me?
  
  
  2. What if counter1 is the number of following records I need to select?
  
  

sql window-functions amazon-athena prestodb

share|improve this question

edited Mar 9 at 16:32

Piotr Findeisen

5,49211644

asked Mar 8 at 5:05

AverellAverell

718

add a comment | 

0

I have the following table:

epochTime,id,counter1,value
123,Alpha,2,2
124,Beta,0,3
135,Alpha,0,1
112,Alpha,0,5
150,Alpha,0,-1
225,Beta,1,2
228,Beta,1,0
300,Beta,0,2

I want to select all records with counter1 > 0 and the record after that, partitioning by id and order by epochTime (the requirement similar to Unix "grep -A 1" command)
So the expected result from the data above would be

epochTime id counter1 value
 123 Alpha 2 2
 135 Alpha 0 1
 225 Beta 1 2
 228 Beta 1 0
 300 Beta 0 2

I am using AWS Athena, and got the following query, which works as expected.

SELECT * FROM (
 SELECT id,
 epochTime,
 counter1,
 value,
 first_value(counter1) OVER (
 PARTITION BY id
 ORDER BY epochTime
 ROWS BETWEEN 1 PRECEDING AND CURRENT ROW
 ) AS preCounter
 FROM testsql
) WHERE counter1 > 0 OR preCounter > 0 

However, I see two problems with the query:

• It is a nested query


• 
  

  I needed to create a dummy column (preCounter). If the requirements on the WHERE condition become more complex (i.e: conditions on multiple columns), I would need to create multiple dummy columns

  
  
  
  1. Are there better solutions (better performance, simpler query, ...) for me?
  
  
  2. What if counter1 is the number of following records I need to select?
  
  

sql window-functions amazon-athena prestodb

share|improve this question

edited Mar 9 at 16:32

Piotr Findeisen

5,49211644

asked Mar 8 at 5:05

AverellAverell

718

add a comment | 

I have the following table:

epochTime,id,counter1,value
123,Alpha,2,2
124,Beta,0,3
135,Alpha,0,1
112,Alpha,0,5
150,Alpha,0,-1
225,Beta,1,2
228,Beta,1,0
300,Beta,0,2

I want to select all records with counter1 > 0 and the record after that, partitioning by id and order by epochTime (the requirement similar to Unix "grep -A 1" command)
So the expected result from the data above would be

epochTime id counter1 value
 123 Alpha 2 2
 135 Alpha 0 1
 225 Beta 1 2
 228 Beta 1 0
 300 Beta 0 2

I am using AWS Athena, and got the following query, which works as expected.

SELECT * FROM (
 SELECT id,
 epochTime,
 counter1,
 value,
 first_value(counter1) OVER (
 PARTITION BY id
 ORDER BY epochTime
 ROWS BETWEEN 1 PRECEDING AND CURRENT ROW
 ) AS preCounter
 FROM testsql
) WHERE counter1 > 0 OR preCounter > 0 

However, I see two problems with the query:

• It is a nested query


• 
  

  I needed to create a dummy column (preCounter). If the requirements on the WHERE condition become more complex (i.e: conditions on multiple columns), I would need to create multiple dummy columns

  
  
  
  1. Are there better solutions (better performance, simpler query, ...) for me?
  
  
  2. What if counter1 is the number of following records I need to select?
  
  

sql window-functions amazon-athena prestodb

share|improve this question

edited Mar 9 at 16:32

Piotr Findeisen

5,49211644

asked Mar 8 at 5:05

AverellAverell

718

epochTime,id,counter1,value
123,Alpha,2,2
124,Beta,0,3
135,Alpha,0,1
112,Alpha,0,5
150,Alpha,0,-1
225,Beta,1,2
228,Beta,1,0
300,Beta,0,2

epochTime id counter1 value
 123 Alpha 2 2
 135 Alpha 0 1
 225 Beta 1 2
 228 Beta 1 0
 300 Beta 0 2

SELECT * FROM (
 SELECT id,
 epochTime,
 counter1,
 value,
 first_value(counter1) OVER (
 PARTITION BY id
 ORDER BY epochTime
 ROWS BETWEEN 1 PRECEDING AND CURRENT ROW
 ) AS preCounter
 FROM testsql
) WHERE counter1 > 0 OR preCounter > 0 

share|improve this question

edited Mar 9 at 16:32

Piotr Findeisen

5,49211644

asked Mar 8 at 5:05

AverellAverell

718

share|improve this question

edited Mar 9 at 16:32

Piotr Findeisen

5,49211644

asked Mar 8 at 5:05

AverellAverell

718

edited Mar 9 at 16:32

Piotr Findeisen

5,49211644

edited Mar 9 at 16:32

Piotr Findeisen

5,49211644

asked Mar 8 at 5:05

AverellAverell

718

asked Mar 8 at 5:05

AverellAverell

718

1 Answer
1

active

oldest

votes

1

You can use lag():

select t.*
from (select t.*,
 lag(counter) over (partition by id order by epochtime) as prev_counter
 from testseql t
 ) t
where counter > 0 or prev_counter > 0;

share|improve this answer

answered Mar 8 at 5:07

Gordon LinoffGordon Linoff

790k35314418

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks Gordon Lag, in this specific example, would make the query less complex by avoiding that "between row and row". But let's say I need to select 2 subsequent records (instead of 1 as in my example), lag won't work. Lag also doesn't help when my WHERE condition is on multiple columns.
  
  – Averell
  Mar 8 at 5:28
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Averell . . . "I want to select all records with counter1 > 0 and the record after that, partitioning by id and order by epochTime ". If you have a different question, ask a new question.
  
  – Gordon Linoff
  Mar 8 at 11:42
  

  
  
  
  

add a comment | 

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1

You can use lag():

select t.*
from (select t.*,
 lag(counter) over (partition by id order by epochtime) as prev_counter
 from testseql t
 ) t
where counter > 0 or prev_counter > 0;

share|improve this answer

answered Mar 8 at 5:07

Gordon LinoffGordon Linoff

790k35314418

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks Gordon Lag, in this specific example, would make the query less complex by avoiding that "between row and row". But let's say I need to select 2 subsequent records (instead of 1 as in my example), lag won't work. Lag also doesn't help when my WHERE condition is on multiple columns.
  
  – Averell
  Mar 8 at 5:28
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Averell . . . "I want to select all records with counter1 > 0 and the record after that, partitioning by id and order by epochTime ". If you have a different question, ask a new question.
  
  – Gordon Linoff
  Mar 8 at 11:42
  

  
  
  
  

add a comment | 

1

You can use lag():

select t.*
from (select t.*,
 lag(counter) over (partition by id order by epochtime) as prev_counter
 from testseql t
 ) t
where counter > 0 or prev_counter > 0;

share|improve this answer

answered Mar 8 at 5:07

Gordon LinoffGordon Linoff

790k35314418

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks Gordon Lag, in this specific example, would make the query less complex by avoiding that "between row and row". But let's say I need to select 2 subsequent records (instead of 1 as in my example), lag won't work. Lag also doesn't help when my WHERE condition is on multiple columns.
  
  – Averell
  Mar 8 at 5:28
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Averell . . . "I want to select all records with counter1 > 0 and the record after that, partitioning by id and order by epochTime ". If you have a different question, ask a new question.
  
  – Gordon Linoff
  Mar 8 at 11:42
  

  
  
  
  

add a comment | 

You can use lag():

select t.*
from (select t.*,
 lag(counter) over (partition by id order by epochtime) as prev_counter
 from testseql t
 ) t
where counter > 0 or prev_counter > 0;

share|improve this answer

answered Mar 8 at 5:07

Gordon LinoffGordon Linoff

790k35314418

select t.*
from (select t.*,
 lag(counter) over (partition by id order by epochtime) as prev_counter
 from testseql t
 ) t
where counter > 0 or prev_counter > 0;

share|improve this answer

answered Mar 8 at 5:07

Gordon LinoffGordon Linoff

790k35314418

answered Mar 8 at 5:07

Gordon LinoffGordon Linoff

790k35314418

answered Mar 8 at 5:07

Gordon LinoffGordon Linoff

790k35314418