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POInsert in mysql view gives wrong output
 

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  1. POInsert in mysql view gives wrong output
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    <p>I am new to mysql views,just came along this problem I have 3 tables</p> <pre><code>personal(name,age,village) office(id,company,location) entertainment(sport,team,music) </code></pre> <p>Now I create a view using the following syntax</p> <pre><code>mysql&gt; CREATE VIEW person AS -&gt; SELECT personal.name,personal.age,personal.village,office.id,office.comp any,office.location,entertainment.sport,entertainment.team,entertainment.music -&gt; FROM personal,office,entertainment; </code></pre> <p>Next I insert into person view </p> <pre><code> INSERT INTO person(name,age,village) VALUES ('jay','40','Pune'); INSERT INTO person(id,company,location) VALUES ('36234','AZcD','Mumbai'); INSERT INTO person(sport,team,music) VALUES ('football','KKR','POP'); </code></pre> <p>I get the output with this properly.(I had to insert sepeartely or else it gives me an error)</p> <pre><code> +------+------+---------+-------+---------+----------+----------+------+-------+ | name | age | village | id | company | location | sport | team | music | +------+------+---------+-------+---------+----------+----------+------+-------+ | jay | 40 | Pune | 36234 | AZcD | Mumbai | football | KKR | POP | +------+------+---------+-------+---------+----------+----------+------+-------+ </code></pre> <p>The problem arises now,when I try to insert the same insert queries again with different values ,I get the following output</p> <pre><code>+-------+------+---------+-------+---------+----------+------------+------+----- ------+ | name | age | village | id | company | location | sport | team | musi c | +-------+------+---------+-------+---------+----------+------------+------+----- ------+ | jay | 40 | Pune | 36234 | AZcD | Mumbai | football | KKR | POP | | Rohit | 42 | Goa | 36234 | AZcD | Mumbai | football | KKR | POP | | jay | 40 | Pune | 86234 | YZcD | Kolkata | football | KKR | POP | | Rohit | 42 | Goa | 86234 | YZcD | Kolkata | football | KKR | POP | | jay | 40 | Pune | 36234 | AZcD | Mumbai | basketball | CSK | Boll ywood | | Rohit | 42 | Goa | 36234 | AZcD | Mumbai | basketball | CSK | Boll ywood | | jay | 40 | Pune | 86234 | YZcD | Kolkata | basketball | CSK | Boll ywood | | Rohit | 42 | Goa | 86234 | YZcD | Kolkata | basketball | CSK | Boll ywood | +-------+------+---------+-------+---------+----------+------------+------+----- ------+ </code></pre> <p>I get 7 new records instead of just 1.And if you see closely the last record is the right record,I mean the record i inserted. What am I doin wrong? The tables are proper after the above queries:</p> <pre><code>mysql&gt; select * from personal; +-------+------+---------+ | name | age | village | +-------+------+---------+ | jay | 40 | Pune | | Rohit | 42 | Goa | +-------+------+---------+ 2 rows in set (0.00 sec) mysql&gt; select * from office; +-------+---------+----------+ | id | company | location | +-------+---------+----------+ | 36234 | AZcD | Mumbai | | 86234 | YZcD | Kolkata | +-------+---------+----------+ 2 rows in set (0.00 sec) mysql&gt; select * from entertainment; +------------+------+-----------+ | sport | team | music | +------------+------+-----------+ | football | KKR | POP | | basketball | CSK | Bollywood | +------------+------+-----------+ 2 rows in set (0.00 sec) </code></pre> <p>Please help.</p>
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    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USSantino 'Sonny' Corleone
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COWhen you don't specify a JOIN between the tables you get a full cartesian product of all the data, i.e., you get all the combination of the tables you have in your select. In this case you have 3 tables with 2 records each. 2*2*2 will give you 8 records.In the end, this is simply a bad design. You should read up on JOINs and table structures before start something like this and then realize later on the mess you got yourself into
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      1. POInsert in mysql view gives wrong output
      1. USFilipe Silva
    2. COI tried JOIN too still it doesnt work this is the query i tried `mysql> CREATE VIEW persona AS -> SELECT personal.p_id,personal.name,personal.village,office.company,office .location -> FROM personal JOIN office ON personal.p_id=office.o_id; Query OK, 0 rows affected (0.14 sec)` Once I insert it says the view is empty whereas the tables get populated
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      1. POInsert in mysql view gives wrong output
      1. USSantino 'Sonny' Corleone
 

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