LEFT JOIN and performance

Hi guys,.

I inherited a previous devloper the query below. T_MAXVALUES has 100,000 rows and T_STA_ERG about 1 m.

The performance is so bad, it works for 5 hours now and I have nothing so I can´t say much about the data of test or how it should look.

It works on Oracle 11 g and I can´t get my head around all JOIN clauses and the ultimate goal but sense that there could be a better way

to achieve what is tried below. All of you guru´s able to immediately spot the big failures?

SELECT DISTINCT T1. PARAMETER, T1. ZERL_MATRIX, T1. MONTHS, T1. ADDITIONAL_CRI,

DECODE (H2. MRL, NULL, (DECODE (H1. MRL, NULL, (DECODE (H3. MRL, NULL, (DECODE (H4. MRL, NULL, NULL, 'R')), 'R')), M1. MRL)), H2. MRL)

OF T_STA_ERG T1

LEFT JOIN (SELECT PARAMETER, ZERL_MATRIX_2, MRL

OF T_MAXVALUES, WHERE ZERL_MATRIX_1 IS NULL) H1

ON T1. PARAMETER = H1. PARAMETER

AND substr (T1. ZERL_MATRIX, 4, 3) = H1. ZERL_MATRIX_2

LEFT JOIN (SELECT PARAMETER, ZERL_MATRIX_1, ZERL_MATRIX_2, MRL

OF T_MAXVALUES

WHERE ZERL_MATRIX_1 IS NOT NULL) H2

ON T1. PARAMETER = H2. PARAMETER

AND substr (T1. ZERL_MATRIX, 1, 3) = H2. ZERL_MATRIX_1

AND substr (T1. ZERL_MATRIX, 4, 3) = H2. ZERL_MATRIX_2

LEFT JOIN (SELECT PARAMETER, ZERL_MATRIX_2, MRL

OF T_MAXVALUES

WHERE ZERL_MATRIX_1 IS NULL) H3

ON T1. PARAMETER = H3. PARAMETER

LEFT JOIN T_MAXVALUES H4

ON substr (T1. ZERL_MATRIX, 1, 3) = H4. ZERL_MATRIX_1

The idea is to get maxvalues lines that at least match the lines of t. The game minimum is the game of columns of the parameter (type 3), or matches the matrix 1 (type 4).

If you get all possible matches, and you will then take the MRLS of the best match: better if the parameter, matrix1 and matrix2 all game, then if parameter and matrix2 match, etc.

What I have not included here are a test for null matrix1. If a match where parameter and matrix2 match, but there's a matrix1 value that does not match the value in T matrix1, will have to be thrown out, then just add this additional condition in the CASE statement.

Untested of course:

Select T1. PARAMETER, T1. ZERL_MATRIX, T1. MONTHS, T1. ADDITIONAL_CRI, Max (MRL) keep dense_rank of first order by type)

Of

(SELECT T1. PARAMETER, T1. ZERL_MATRIX, T1. MONTHS, T1. ADDITIONAL_CRI,

-case when T1. PARAMETER = H.PARAMETER and substr (T1. ZERL_MATRIX, 1, 3) = H2. ZERL_MATRIX_1 AND substr (T1. ZERL_MATRIX, 4, 3) = H2. ZERL_MATRIX_2 then 1

When T1. PARAMETER = H.PARAMETER and substr (T1. ZERL_MATRIX, 4, 3) = H1. ZERL_MATRIX_2 then 2

When T1. PARAMETER = H.PARAMETER then 3

When substr (T1. ZERL_MATRIX, 1, 3) = H.ZERL_MATRIX_1 then 4

end match_type, h.mrl

OF T_STA_ERG T1

LEFT JOIN T_MAXVALUES h on (T1. PARAMETER = H.PARAMETER or substr (T1. (ZERL_MATRIX, 1, 3) = H.ZERL_MATRIX_1)

)

Group T1. PARAMETER, T1. ZERL_MATRIX, T1. MONTHS, T1. ADDITIONAL_CRI;

Tags: Database

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    SELECT ' 20', '48AW', to_date (January 1, 2011 ',' MON-DD-YYYY ""), to_date (1 January 2012 ',' MON-DD-YYYY') OF double

    UNION ALL

    SELECT ' 20', '42KD', to_date (January 1, 2010 ',' MON-DD-YYYY ""), to_date (December 31, 2011 ',' MON-DD-YYYY') OF double

    UNION ALL

    SELECT ' 20', '46LD', to_date (January 2, 2012 ',' MON-DD-YYYY ""), double NULL

    UNION ALL

    SELECT ' 30 ', 45 MI', to_date (January 1, 2011 ',' MON-DD-YYYY'), to_date (1 January 2012 ',' MON-DD-YYYY') FROM dual

    UNION ALL

    SELECT ' 30', '44KH', to_date (January 1, 2010 ',' MON-DD-YYYY ""), to_date (December 31, 2011 ',' MON-DD-YYYY') OF double

    UNION ALL

    SELECT ' 30', '43LL', to_date (January 2, 2012 ',' MON-DD-YYYY ""), double NULL

    UNION ALL

    SELECT ' 40', '41', to_date (January 1, 2011 ',' MON-DD-YYYY ""), to_date (1 January 2012 ',' MON-DD-YYYY') OF double

    UNION ALL

    SELECT ' 40', '40', to_date (January 1, 2010 ',' MON-DD-YYYY ""), to_date (December 31, 2011 ',' MON-DD-YYYY') OF double

    UNION ALL

    SELECT ' 40', '42DX', to_date (January 2, 2012 ',' MON-DD-YYYY ""), double NULL

    UNION ALL

    SELECT ' 50', '48IB', to_date (January 1, 2011 ',' MON-DD-YYYY ""), to_date (1 January 2012 ',' MON-DD-YYYY') OF double

    UNION ALL

    SELECT '50 ', 47 DL', to_date (January 1, 2010 ',' MON-DD-YYYY'), to_date (December 31, 2011 ',' MON-DD-YYYY') FROM dual

    UNION ALL

    SELECT ' 50', '42A', to_date (January 2, 2012 ',' MON-DD-YYYY ""), double NULL

    )

    SELECT

    1. ES.emp_id,
    2. ES.last_name,
    3. ES.first_name,
    4. EP.title_id,
    5. EP.position_start,
    6. EP.position_end

    Employees are

    LEFT JOIN emp_contracts ec

    ON ec.emp_id = es.first_name

    LEFT JOIN emp_positions ep

    ON ep.emp_id = es.emp_id

    WHERE ec.contract_end IS NULL AND ep.position_end IS NULL

    Hello

    AquaNX4 wrote:

    Good day ladies------Gentlemen\ gurus-Experts-and Al:

    Just when I thought I got my mind wrapped around the notion of NULL value, as defined by Oracle, I met what follows below.  Basically, what you are watching is how our employees of the human resources tables are set up (for the most part).  We have the employees, employee contracts table and the tables of positions.  When I want to make a list of active staff, I always use the filter end date, you will see below in the Super request, essentially looking for staff who do not have a contract AND a position end date entered in the DB.  It works like a charm.  However, today, I noticed an official on the list, who has never had a position is entered in the comic book, and he had an 'open' contract  In my example below, why would "Hal Jordan" appear on the active staff list?  Yes, he spends the first part of my predicate (contract_end is null), but it does not work (at least by my understanding) past the second part of the predicate which is position_end has the value NULL because there not even a record is entered in the comics!  Why would he appear?  Is it because of the LEFT JOIN or a NULL rule type, I'm not aware of?  ...

    It's the outer join.

    When you say

    Employees are

    LEFT JOIN emp_positions ON ep.emp_id = es.emp_id ep

    then, at the time when the WHERE clause is evaluated, the result set contains at least 1 row for each line of employees.  If there is no line in emp_postitions that meet the join condition, then all the columns that should be provided by the emp_positions table will be NULL. This is precisely what concerns the outer join.

    Think about it for a minute.  NULL means the absence of any value.  Is there is no corresponding row in the emp_positions table, then there is no value for emp_position.position_end.  If so doesn't; "have a value, then, by definition, it is NULL.

    It if were not NULL, then this would mean that it had a value.  Would what value?  Why the request would give him one value rather than another?

    Thanks for the display of the data of the sample; It's always useful!

  • Double left join creates a unwanted loop...

    I have therefore two paintings, I need to extract the counts of "tickets".

    I want to have the date given match then I use a 'connect by level' so that the same dates without data will have records in the result set.

    There are two tables I want to join on this "timeline" when I join each of them that individually, it works but when I join together that there is an order of operations issue I'm not sure how to move.

    ORIGINAL DATA:

    TABLE SMINCREQ:

    OPEN_DATE NUMBER
    JANUARY 12, 2015IM392039
    JANUARY 12, 2015IM399495
    JANUARY 12, 2015RM394950
    JANUARY 13, 2015IM394958
    JANUARY 13, 2015
    		RM394958

    TABLE SMINTERACTIONS:

    OPEN_DATE INCIDENT_ID
    JANUARY 12, 2015SD394858
    JANUARY 12, 2015SD399495
    JANUARY 12, 2015SD394950
    JANUARY 13, 2015SD394958
    JANUARY 13, 2015
    		SD394958

    THE QUERY:

    SELECT to_char(DAYS_,'DD-MON-YYYY'),
      
      sum(decode(INSTR(SMINCREQ."NUMBER",'IM'),'1','1',0)) "INCIDENT",
      sum(decode(INSTR(SMINCREQ."NUMBER",'RM'),'1','1',0)) "REQUEST"
     --sum(decode(INSTR(SMINTERACTIONS.INCIDENT_ID,'SD'),'1','1',0)) "INTERACTION"  
      FROM
  ( SELECT (TRUNC(to_date(SYSDATE-ROWNUM),'DD')) DAYS_ FROM DUAL
CONNECT BY LEVEL <= (SELECT 14 FROM DUAL)
  ) THE_TIMELINE
    LEFT OUTER JOIN SMINCREQ ON  (to_char(DAYS_,'DD-MON-YYYY')=to_char(SMINCREQ.OPEN_TIME,'DD-MON-YYYY')  and (OPEN_GROUP like '%HELP%'))
    --LEFT OUTER JOIN SMINTERACTIONS on (to_char(DAYS_,'DD-MON-YYYY')=to_char(SMINTERACTIONS.OPEN_TIME,'DD-MON-YYYY')  and PRIMARY_ASSIGNMENT_GROUP like '%HELP%')
    GROUP BY to_char(DAYS_,'DD-MON-YYYY') ORDER BY to_char(DAYS_,'DD-MON-YYYY')
  ;

    When I run the present and just get the number of SMINCREQ is

    DATEINCIDENTSREQUEST
    JANUARY 12, 20151034
    JANUARY 13, 20155910

    When I run the query for SMINTERACTIONS I get

    DATEINTERACTION
    JANUARY 12, 201555
    JANUARY 13, 201550

    When I try to run the two left joins them together I get:

    DATEINCIDENTSAPPLICATIONSINTERACTIONS
    JANUARY 12, 201556652205885
    JANUARY 13, 201529505003450

    I know that what is happening is a loop where the date is is developed in a relationship 1 to many through the joints and then the GROUP is not the case until the end.

    What I want to achieve is:

    DATEINCIDENTSREQIESTINTERACTION
    JANUARY 12, 2015103455
    JANUARY 13, 2015591050

    Thanks for the tips

    I decided to go this route that will just join the new data (INTERACTIONS) of INCIDENTS already implemented and APPLICATIONS:

    SELECT NULL LINK,DAYS,INCIDENT,"REQUEST",sum(decode(INSTR(SMINTERACTIONS.INCIDENT_ID,'SD'),'1','1',0)) "INTERACTION" from(

SELECT to_char(DAYS_,'DD-MON-YYYY') DAYS,sum(decode(INSTR(SMINCREQ."NUMBER",'IM'),'1','1',0)) "INCIDENT",
      sum(decode(INSTR(SMINCREQ."NUMBER",'RM'),'1','1',0)) "REQUEST"
      FROM
  ( SELECT (TRUNC(to_date(SYSDATE-ROWNUM),'DD')) DAYS_ FROM DUAL
 CONNECT BY LEVEL <= (SELECT 14 FROM DUAL)
  ) THE_TIMELINE
    LEFT OUTER JOIN SMINCREQ ON  (to_char(DAYS_,'DD-MON-YYYY')=to_char(SMINCREQ.OPEN_TIME,'DD-MON-YYYY')  and (OPEN_GROUP like '%HELP CENTER%')
)

    GROUP BY to_char(DAYS_,'DD-MON-YYYY') ORDER BY to_char(DAYS_,'DD-MON-YYYY')
) LEFT JOIN SMINTERACTIONS on (DAYS=to_char(OPEN_TIME,'DD-MON-YYYY') and (PRIMARY_ASSIGNMENT_GROUP like '%HELP CENTER%'))
GROUP BY DAYS,INCIDENT,"REQUEST" order by DAYS ASC;

    Thanks for all the entries...

  • Left join

    Hello world

    Im trying to create the query that displays the values that are not available in the other table.

    Scenario:

    I have two tables, the material and materialfolder. I want to display documents that are not available in materialfolder.

    Here's my query

    SELECT m.material_id
    ,  m.MATERIAL_TYPE_ID
    ,  m.name
    ,  m.created
        FROM material m
        LEFT  JOIN materialfolder mf ON m.material_id = mf.material_id
        where to_char(m.CREATED, 'yyyy') >= ('2011')
        and to_char(m.CREATED, 'yyyy') <= ('2013');

    The result does not show the correct values. Don't know what my error here...

    Hoping that someone could help me.

    Thank you.

    Kind regards

    Ed

    Hello

    If you just want to know the values that are not available in materialfolder, use a NOT EXISTS condition:

    SELECT m.material_id

    m.MATERIAL_TYPE_ID

    $m.name

    m.created

    MATERIAL m

    If NOT EXISTS (select null from materialfolder mf

    where m.material_id = mf.material_id

    )

    AND m.CREATED > = TO_DATE('01/01/2011', 'dd/mm/yyyy') AND m.CREATED< to_date('01/01/2014',="">

  • LEFT JOIN DUPLICATION PROBLEM

    Hello

    I'm having a problem with the left join query, when I join table a two table based on column task1 I get duplicate in table1.task1, table1.price.

    Table1. Task1Table1. Pricetable2. Task1table2. Resourcetable2. Price
    001100001A50
    001100001B250

    How can I make a request to get a result as below.

    Table1. Task1Table1. Pricetable2.Task2table2. Resourcetable2. Price
    001100001A50
    001B250

    Thank you.

    Note that your query uses an inner join. Your original question mentioned a join left, generally interpreted as meaning a left OUTER join.

    Anyway, according to Frank, you can use the BREAK command in SQL * Plus for the goal sought through formatting. You can also use an analytical function as Roger suggests. I think ROW_NUMBER() might do the trick, but we must be clear about the criteria for partitioning and ordering the results, for example

    WITH table1 AS (
  SELECT '001' AS task1
       , 100 AS price
  FROM   dual
), table2 AS (
  SELECT '001' AS task1
       , 'A' AS resources
       , 50 AS price
  FROM   dual
  UNION ALL
  SELECT '001' AS task1
       , 'B' AS resources
       , 250 AS price
  FROM   dual
)
SELECT DECODE(ROW_NUMBER() OVER (PARTITION BY t1.task1, t1.price ORDER BY t2.resources, t2.price),1,t1.task1) AS task1_alt
     , DECODE(ROW_NUMBER() OVER (PARTITION BY t1.task1, t1.price ORDER BY t2.resources, t2.price),1,t1.price) AS price_alt
     , t2.task1 AS task_with_resource
     , t2.resources
     , t2.price
FROM   table1 t1
INNER JOIN table2 t2
ON     t1.task1 = t2.task1
ORDER BY t1.task1, t1.price, t2.resources, t2.price;

  • Interesting behavior of left join

    We will create 3 tables as follows:


    CREATE TABLE "A1" ()"A1_ID" NUMBER ENABLE NON NULL,CONSTRAINT "A1_PK" SELECT the PRIMARY KEY ('A1_ID') );

    CREATE TABLE "A2" ()"A2_ID" NUMBER ENABLE NON NULL,CONSTRAINT "A2_PK" SELECT the PRIMARY KEY ('A2_ID'));

    CREATE TABLE "A12" ()'A12_ID' ENABLE NUMBER NOT NULL,'A1_ID' ENABLE NUMBER NOT NULL,'A2_ID' ENABLE NUMBER NOT NULL,"A12_PK" PRIMARY KEY ('A12_ID'), CONSTRAINTREFERENCES of FOREIGN ("A1_ID") of CONSTRAINT "A12_A1_FK1" "BUTUNLESIK" KEY "" A1 "("A1_ID") ENABLE,KEY REFERENCES FOREIGN ("A2_ID") of CONSTRAINT 'A12_A2_FK1' 'BUTUNLESIK '. ("" A2 "("A2_ID") ALLOW);

    We insert the values as follows:

    Insert into A1 values (1);

    Insert into A1 values (2);

    Insert into A1 values (3);

    Insert 4 A1;

    Insert into A1 values (5);

    Insert into A1 values (6);

    Insert into A2 values (1);

    insert into values A12 (1,1,1);

    Tables a1 and A2 are just simple tables with primary keys and A12 table contains many-to-many relationship between them.

    When I run the query below,

    SELECT * A1 A1 A12 A12 LEFT JOIN ON a1.a1_id = a12.a1_id A2 LEFT JOIN A2 ON a2.a2_id = a12.a2_id WHERE a2.a2_id IS NULL;

    I get the following results, as I predicted:

    A1_ID A12_ID A1_ID A2_ID A2_ID

    ----------     ----------    ----------     ---------- ----------

    6

    5

    4

    3

    2

    However when I run the second query below (where I select only the a1 id column instead of "*")

    SELECT a1.a1_id A1 A1 A12 A12 LEFT JOIN ON a1.a1_id = a12.a1_id A2 LEFT JOIN A2 ON a2.a2_id = a12.a2_id WHERE a2.a2_id IS NULL;


    I get nothing, no lines have been selected. When I look at the plan of the second query I see a predicate to filter such as "'NULL IS NOT NULL". " I guess that this does not return results. Is this a bug, or y at - it a satisfactory explanation for this behavior?

    Step 1 - check the execution plans.

    At first glance, this looks like a variant of https://forums.oracle.com/thread/2594321

    Concerning

    Jonathan Lewis

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