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POHow can I query info from a special table structure in MySQL?
 

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  1. POHow can I query info from a special table structure in MySQL?
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    <p>I got a problem with a query or a table in MySQL and i spent so much time to solve it, but i still have no answer. So i need your help.</p> <p>The format of the table is something like that</p> <pre><code>------------------------------------------------------------- col1 | col2 | col3 | col4 | col5 | col6 | ------------------------------------------------------------- a | b | c | null | null | null | ------------------------------------------------------------- null | null | null | 1 | 2 | 3 | ------------------------------------------------------------- null | null | null | 4 | 5 | 6 | ------------------------------------------------------------- null | null | null | 7 | 8 | 9 | ------------------------------------------------------------- d | e | f | null | null | null | ------------------------------------------------------------- null | null | null | 10 | 11 | 12 | ------------------------------------------------------------- null | null | null | 13 | 14 | 15 | ------------------------------------------------------------- null | null | null | 16 | 17 | 18 | ------------------------------------------------------------- ... </code></pre> <p>The table has a structure like that because it loads data from a big-size csv file (about 300k lines). All i want is write a mysql statement that query records in the fastest time that it can and its result is in format:</p> <p>(a,b,c,1,2,3),(a,b,c,4,5,6),(a,b,c,7,8,9),(d,e,f,10,11,12),(d,e,f,13,14,15),(d,e,f,16,17,18) ...</p> <p>But ... how? Please help me to solve the problem. Thks in advance</p>
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    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USColin Brock
    1. USDzung Nguyen
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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
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      1. PTAnswer
    1. This table or related slice is empty.
    1. COYou'd be better off massaging the data client-side, rather than trying to come up with a query that has to both look FORWARD (for the 1,2,3 value) and BACKWARD.
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      1. POHow can I query info from a special table structure in MySQL?
      1. USMarc B
    2. COThks for commenting. But the problem is it must load data from big size csv file to that mysql table (for the fastest performance) and my task is getting info from this table structure for the client module. The number of the records is bigger than above many times. :(
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      1. POHow can I query info from a special table structure in MySQL?
      1. USDzung Nguyen
    3. COThat's fine, but I'm saying that after loading the .csv into the table, you should run another query that loops over the lable, row-by-row, and fills in the missing data. While it's a bit tedious to create a query that can look "back" to fill in missing data (so the a,b,c values get carried forward into the rows they're missing), it's very difficult to make a query that can look FORWARD, so the missing nulls on the a,b,c row get filled in.
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      1. POHow can I query info from a special table structure in MySQL?
      1. USMarc B
 

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