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POretrieving date in SELECT statement from mysql
 

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  1. POretrieving date in SELECT statement from mysql
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    <p>I wrote the following mysql code:</p> <pre><code>select trade_dt, ticker_id, settle_price, volume from hist where volume &gt; 0 and trade_dt between '06/22/2011' and '06/30/2011'; </code></pre> <p>but unfortunately, it returns dates outside the time window as follows:</p> <pre><code>+------------+------------+--------------+--------+ | trade_dt | ticker_id | settle_price | volume | +------------+------------+--------------+--------+ | 06/23/2006 | N (Jul 06) | 156.900000 | 90 | | 06/26/2006 | N (Jul 06) | 155.600000 | 63 | | 06/27/2006 | N (Jul 06) | 159.300000 | 79 | | 06/28/2006 | N (Jul 06) | 159.600000 | 57 | | 06/29/2006 | N (Jul 06) | 143.400000 | 511 | | 06/30/2006 | N (Jul 06) | 140.200000 | 342 | | 06/23/2005 | V (Oct 05) | 151.200000 | 61 | | 06/23/2011 | U (Sep 11) | 22.500000 | 6284 | | 06/24/2011 | U (Sep 11) | 23.100000 | 4505 | | 06/27/2011 | U (Sep 11) | 22.650000 | 3118 | | 06/28/2011 | U (Sep 11) | 22.100000 | 3707 | | 06/29/2011 | U (Sep 11) | 21.500000 | 5830 | | 06/30/2011 | U (Sep 11) | 20.750000 | 9207 | | 06/23/2008 | F (Jan 09) | 23.260000 | 2 | </code></pre> <p>and I wonder if that is because my trade_dt is defined as a string in hist table.EDITED table to replace char(10) with date</p> <pre><code>desc hist; +-----------------+---------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-----------------+---------------+------+-----+---------+----------------+ | futures_id | int(11) | NO | PRI | NULL | auto_increment | | trade_dt | date | NO | | NULL | | | ticker_id | varchar(46) | NO | MUL | NULL | | | settle_price | decimal(10,6) | NO | | NULL | | | change_in_price | decimal(10,6) | NO | | NULL | | | volume | bigint(11) | NO | | NULL | | | open_int | bigint(11) | NO | | NULL | | +-----------------+---------------+------+-----+---------+----------------+ </code></pre> <p>how do I fix my date problem?</p> <p>ok, I changed the <code>trade_dt</code> field to <code>date</code> instead of <code>char(10)</code> and now when I run the below statement to load the data into the DB, it inserts blanks for dates, just because how the date is formatted in the data file.</p> <pre><code>LOAD DATA LOCAL INFILE '$fn' INTO TABLE $tn FIELDS TERMINATED BY ',' LINES TERMINATED BY '\r\n' (trade_dt,ticker_id,settle_price,change_in_price, volume, open_int); </code></pre> <p>this is a sample of raw data:</p> <pre><code>03/30/2012,Z (Dec 12),25.81,25.81,25.50,25.70,25.60,-0.45,24,0,318 </code></pre>
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    1. COAt first - you need to store dates in the appropriate column types, such as `date`, not in `char`
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    2. COI edited the table converting the `trade_dt` to `date`, but when I run the `load` statement, it inserts blanks for trade_dt. how do I cast it in the `load` statement
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    3. COyou need to change all your queries to pass the date in a **valid** format `YYYY-MM-DD`
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      1. USzerkms
 

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