SQL query that counts records??

I have an equipment maintenance table and I'm trying get a list of unique equipment IDs along with a count of total maintenance records for that peice of equipment.
Say for instance the table is set up like this
maintenance_table
equipment_id varchar(20)
maintenance_date DATE
maintenancelog_id varchar(20)
I'm trying to do something like
SELECT DISTINCT equipment_id, (select count(*) from maintenance_table where equipment_id = "the one for this row"), maintenance_date from maintenance_table WHERE
condition = 'something';
The subquery works fine when I hard code an id in it, but I need it to be dynamic and show the correct count for each row.
Can anyone help?
Thanks,
George

SELECT equipment_id, count(*) from maintenance_table group by equipment_id;

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Hi,
Plz try this and let me know this works or not...
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hi János Nagy
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How to write sql query for counting pairs from below table??

Below is my SQL table structure.
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Hi Sir,
I have below data set.
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10      1300      1300
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Your requiremnt is more of a reporting request which should not be handled in SQL. For example in SQL Plus you can use the BREAK command
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           CLARK
        20 JONES
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           SMITH
           ADAMS
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           BLAKE
11 rows selected.
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select decode(rno, 1, deptno) deptno
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2 as
3 (
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Combine the relevant data from the three tables (using UNION ALL) in a sub-query. without the GROUP BY.
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     SELECT     TO_CHAR (emp_start, 'YYYY') AS yr     FROM     Clerk
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hi1
i have 1000 rows in my table that are not unique. i
have added a new column named sno.initially that
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SQL query that returns exclusive rows from groups

I'm using modified scott/tiger data for this.
I've got two tables
DEPT_X
DEPTNO     DNAME             LOC     CODE_ID     SUB_DEPTNO
10     ACCOUNTING     NEW YORK 111     101
10     SALES             ATWN      111     102
10     SALES             BTWN      112     103
20     RESEARCH     DALLAS      111     201
20     RESEARCH     CTWN      111     202
30     SALES             CHICAGO      111     301
40     OPERATIONS     BOSTON      112     401and
BI_PD
CODE_ID     PD_TYPE     BI_TYPE
111          -1
112     -1     I want to write a query that joins the code_ids of the two tables and lists out either only the records from DEPT_X who's code_ids have a -1 in the PD_TYPE(112) column and none of the code_ids that have a -1 in the BI_TYPE(111) column for each department or if that department has code_ids for the BI_TYPE (111), list out those rows. So for Deptno 10 you'll only get the row with SUB_DEPTNO = 103. But if for that DEPTNO= 20 you'll get the rows for both SUB_DEPTNO = 201 and 202.
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What is the query to do this?
Message was edited by:
user623359
Message was edited by:
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user623359
Message was edited by:
user623359
Message was edited by:
user623359

One way could be:
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - 64bit Production
With the Partitioning, OLAP and Data Mining options
SQL> with dept_x as (
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union all
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4      select 10, 'SALES', 'BTWN', 112, 103 from dual union all
5      select 20, 'RESEARCH', 'DALLAS', 111, 201 from dual union all
6      select 20, 'RESEARCH', 'CTWN', 111, 202 from dual union all
7      select 30, 'SALES', 'CHICAGO', 111, 301 from dual union all
8      select 40, 'OPERATIONS', 'BOSTON', 112, 401 from dual ),
9 --
10 bi_pd as(
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14 t as(
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18 select a.deptno,a.sub_deptno
19 from dept_x a, bi_pd b
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21        (a.deptno) not in (select deptno from t)
22 union
23 select deptno,sub_deptno from t;
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        10        103
        20        201
        20        202
        30        301
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Sql query - Selecting last recorded values for each date in specified period

Hello,
Can someone please help me with my problem.
I'm trying to get last recorded balance for each day for specific box (1 or 2) in specified period of days from ms access database using ADOTool.
I'm trying to get that information with SQL query but so far unsuccessfully...
My table looks like this:
Table name: TestTable
Date Time Location Box Balance
20.10.2014. 06:00:00 1 1 345
20.10.2014. 12:00:00 1 1 7356
20.10.2014. 18:45:00 1 1 5678
20.10.2014. 23:54:00 1 1 9845
20.10.2014. 06:00:02 1 2 35
20.10.2014. 12:00:04 1 2 756
20.10.2014. 18:45:06 1 2 578
20.10.2014. 23:54:10 1 2 845
21.10.2014. 06:00:00 1 1 34
21.10.2014. 12:05:03 1 1 5789
21.10.2014. 15:00:34 1 1 1237
21.10.2014. 06:00:00 1 2 374
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22.10.2014. 10:00:00 1 1 1234
22.10.2014. 17:03:45 1 1 3415
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22.10.2014. 06:00:05 1 2 562
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23.10.2014. 06:00:00 1 1 9876
23.10.2014. 09:13:00 1 1 223
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23.10.2014. 19:47:40 1 1 3456
23.10.2014. 21:30:00 1 1 789
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23.10.2014. 19:47:55 1 2 346
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23.10.2014. 23:57:18 1 2 25
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24.10.2014. 12:30:22 1 1 8329
24.10.2014. 23:50:19 1 1 2225
24.10.2014. 06:01:00 1 2 3546
24.10.2014. 12:30:26 1 2 89
24.10.2014. 23:51:10 1 2 25
Let's say the period is 21.10.2014. - 23.10.2014. and I want to get last recorded balance for box 1. for each day. The result should look like this:
Date Time Location Box Balance
21.10.2014. 15:00:34 1 1 1237
22.10.2014. 22:00:00 1 1 6742
23.10.2014. 23:57:12 1 1 25
So far I've managed to write a query that gives me balance for ONLY ONE date (date with highest time in whole table), but I need balance for EVERY date in specific period.
My incorrect code (didn't manage to implement "BETWEEN" for dates...):
SELECT TestTable.[Date], TestTable.[Time], TestTable.[Location], TestTable.[Box], TestTable.[Balance]
FROM TestTable
WHERE Time=(SELECT MAX(Time)
FROM TestTable
WHERE Location=1 AND Box=1 );
Tnx!
Solved!
Go to Solution.

For loop
following query keep day (here 24 in below query) Variable from ( 1 to 28-29/30/31 as per month)
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FROM Test Table.
WHERE Time=(SELECT MAX(Time) FROM TestTable WHERE Location=1 AND Box=1 )
AND DATE = "2014-10-24";
PBP (CLAD)
Labview 6.1 - 2014
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