Question

can anyone help me on how should i count the jq.batchid != 0 and tl.taskqueueid IS NOT NULL

Here is the initial data:

+---------------+-----------+---------+---------------+
|  taskqueueid  |  batchid  |  jobid  |  taskqueueid  |
+---------------+-----------+---------+---------------+
|      19       |     0     |   140   |     (NULL)    |
+---------------+-----------+---------+---------------+
|      21       |    103    |   140   |       21      |
+---------------+-----------+---------+---------------+
|      22       |    104    |   140   |       22      |
+---------------+-----------+---------+---------------+
|      23       |    105    |   140   |     (NULL)    |
+---------------+-----------+---------+---------------+
|      20       |     0     |   140   |     (NULL)    |
+---------------+-----------+---------+---------------+

Here is my query:

SELECT COUNT(jq.batchid),COUNT(tl.taskqueueid)
  FROM jobqueue jq
  LEFT JOIN taskslogs tl
    ON jq.taskqueueid=tl.taskqueueid
   AND jq.documentgroupid=0
   AND jq.batchid!=0
   AND tl.statusDefinitionID=1
 WHERE jq.jobid=140;

The above query result is:

+--------------------+-----------------------+
| COUNT(jq.batchid)  | COUNT(tl.taskqueueid) |
+--------------------+-----------------------+
|         5          |           2           |
+--------------------+-----------------------+

And I want a result of:

+--------------------+-----------------------+
| COUNT(jq.batchid)  | COUNT(tl.taskqueueid) |
+--------------------+-----------------------+
|         3          |           2           |
+--------------------+-----------------------+

Can anyone help me on how should I do this.

Answer 1

There’s a very nice trick for these kind of count:

SELECT
    SUM(jq.batchid > 0) as nb_batchid_positive,
    SUM(tl.taskqueueid IS NOT NULL) as nb_taskqueueid_not_null
FROM jobqueue jq
LEFT JOIN taskslogs tl
    ON jq.taskqueueid=tl.taskqueueid
    AND jq.documentgroupid=0
    AND tl.statusDefinitionID=1
WHERE jq.jobid=140;

SUM(BOOLEAN CONDITION) gives you exactly the number of rows matching the condition.