
Archives of the TeradataForumMessage Posted: Fri, 30 Apr 2004 @ 19:55:41 GMT
Interesting problem! Try SELECT 86399999 (DECIMAL(18,0)) T ,CAST ( ('19691231' (DATE)) + T / 86400000.00000000 AS TIMESTAMP(3) ) + INTERVAL '17' HOUR + (T / 1000.000 MOD 86400) * CAST('00:00:01' AS INTERVAL HOUR TO SECOND) T represents your @timestamp parameter. There are several things happening in this computation: 1) Add the number of whole days (T / 86400000.00000000) to your starting date. 2) Add the '17:00:00' timestamp. 3) Add the remaining seconds. 1) Teradata has a max DECIMAL(18,0) which is less than your parameter DECIMAL(19,0) 2) The number 86400000 is the number of milliseconds in a day. In order to avoid rounding, you must use the DECIMAL(16,8) representation. 3) The remaining seconds are found by (T / 1000.000 MOD 86400), which is multiplied by the onesecond HOUR TO SECOND INTERVAL to get the correct remaining HOUR TO SECOND duration. For what it's worth, I came across an interesting bug while writing this solution. Multiplying intervals by a decimal number works correctly only for the hours, minutes, and seconds components. The fractionalsecond component does not multiply higher than the seconds component. To see what I mean, try the following SELECT: SELECT CAST('00:00:00.1' AS INTERVAL HOUR TO SECOND) A ,999 * A ,1000 * A
 
 
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