We can make the use of following statement to get the difference between the two timestamp values in months as shown below – Consider two timestamp values ‘-00.00.00’ and ‘-00.00.00’ and we have to calculate the difference between the two mentioned values in terms of months. Now, let us have a look at how we can implement the TIMESTAMPDIFF() function to calculate the duration or internal that is the difference between two TIMESTAMP values. There are 60 seconds in a single minute.While evaluating the timestamp difference the following assumptions are made by the IBM in DB2 – ((days+(30*months))/7) + (52*years) and is an integer valueĬalculated as (months+(12 * years))/3 and is an integer value (days+(30*months)) + (365*years) and is an integer value The evaluation of the output value of the function for each of the possible interval type specified is done as shown in the below table –Įvaluation of the duration value in terms of those elements In case, if we specify any of the argument’s value as NULL the function will result into the NULL value as well. The result of the TIMESTAMPDIFF() function gives the value which is an integer number which has the same sign as provided in the second argument’s string expression. If this value is negative then it is treated to be on left side. The position of the character with respect to decimal point. The valid value corresponding to the value to be specified In order to understand the elements and contents of specifying the string expression in the TIMESTAMPDIFF() function’s argument, refer to the below table – The element value to be mentioned in string It is necessary that the string value that is specified should not have more than 6 digits to the right side of the decimal point. The value of this expression is supposed to be the difference between the two TIMESTAMP values that are provided and that value is further converted into the character string which has a length of 22 characters. In case of graphic string specified as the second argument, it is firstly converted implicitly into a character string value and the function is executed to evaluate the resultant value. It can even be a graphic string datatype provided that value should not be in LOB. The second argument will be a string expression that should return the value that is in the datatype of either a built-in CHAR type or VARCHAR datatype. The above table shows all the interval types and the corresponding nature of which number should be mentioned as first argument if you want to get the output in the expected type. Type of the interval considered for output The following table shows how the value of first argument is considered internally. The expression of value that is mentioned in the first argument should be valid and belong from any of the below mentioned values as each value individually represents the interval type that we want our result in. The numeric datatype expression that is expected in the first argument can be either the built-in integer or small int datatype. The first argument can be and expression that evaluates to numeric datatype or a constant numeric value. In the above syntax, we can observe that the TIMESTAMPDIFF () function accepts two parameter values to it. TIMESTAMPDIFF (first argument, second argument) I can provide more details, if necessary.Hadoop, Data Science, Statistics & others Is there a catalog query that would help? However, it would be nice if there was an easier way to determine whether the table has a row change timestamp.įor z/OS it isn't clear what should be checked. That would mean checking each column in each table, but it's doable. For Db2 LUW it is possible to query SYSCAT.COLUMNS, since this has a a field called ROWCHANGETIMESTAMP which would be either 'Y' or 'N'. The difficulty is that I'm unsure how to tell whether the table in question has a row change timestamp. All this has been gleaned from the IBM documentation. When the table contains a row change timestamp, then the LOAD statement requires a ROWCHANGETIMESTAMPOVERRIDE modifier. The syntax for this is identical for both Db2 types. In order to do the copy, I wish to use the Db2 load utility and row change timestamps need to be preserved. Some tables contain rows defined like this: TIMESTAMP NOT NULL GENERATED ALWAYS FOR EACH ROW ON UPDATE AS ROW CHANGE TIMESTAMP The target tables exist and have all the required columns. The tables in question lie on a Db2 for z/OS database (v12) and on a Db2 LUW database (v11.1). I need to copy some Db2 tables programmatically (java 11 using the standard Db2 jdbc driver).
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