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Creation of transaction-time base tables is similar but not completely analogous to the creation of valid-time base tables: CREATE TABLE S ( S# S#, TRANSACTIONTIME PRIMARY KEY ( S# ) ) AS TRANSACTIONTIME ; CREATE TABLE SP ( S# S#, P# P#, TRANSACTIONTIME PRIMARY KEY ( S#, P# ), TRANSACTIONTIME FOREIGN KEY ( S# ) REFERENCES S ) AS TRANSACTIONTIME ; The AS TRANSACTIONTIME specifications are more or less self-explanatory; observe, however, that no data type is specified, because (as mentioned in a footnote earlier) transaction times in TSQL2 are always of a data type that is chosen by the DBMS. The TRANSACTIONTIME prefixes on the primary and foreign key specifications are analogous to their VALIDTIME counterparts except that there seems to be no point in having them (although they are permitted), because the corresponding current constraints must surely imply that these transaction-time sequenced constraints are always satisfied. (By definition, transaction times cannot be updated; it therefore follows that constraints that apply to the current state of affairs
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11. Actually, reference [13] says e is the immediate predecessor of the end of time, but this is surely just a slip, probably arising from confusion over notation (in effect, confusing [b:e] with [b:e) see reference [6]). Reference [15] says it is the end of time.
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CHAPTER 28 AN OVERVIEW AND ANALYSIS OF PROPOSALS BASED ON THE TSQL2 APPROACH
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must apply equally to the historical record, since everything in that historical record must once have been current.) Also, if the prefix is omitted on a foreign key specification, then the referenced table can be of any kind (not necessarily one with temporal support); in every case, the constraint is then treated as a current constraint rather than a transaction-time sequenced one. Adding transaction-time support to existing tables via ALTER TABLE is analogous to its valid-time counterpart. In particular, in rows that already exist when the transaction-time support is added, the new (hidden) column is apparently set to the same initial value as it is in the case of adding valid time i.e., it is set to a period of the form [b:e], where b is the time of execution of the ALTER TABLE and e is the end of time even though neither the b value nor the e value seems to make any sense (the b value is clearly incorrect, and the e value means we have transaction times that refer to the future). We omit further discussion here.
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Finally, here are the CREATE TABLE statements needed to create bitemporal versions of tables S and SP: CREATE TABLE S ( S# S#, VALIDTIME AND TRANSACTIONTIME PRIMARY KEY ( S# ) ) AS VALIDTIME PERIOD ( DATE ) AND TRANSACTIONTIME ; CREATE TABLE SP ( S# S#, P# P#, VALIDTIME AND TRANSACTIONTIME PRIMARY KEY ( S#, P# ), VALIDTIME AND TRANSACTIONTIME FOREIGN KEY ( S# ) REFERENCES S ) AS VALIDTIME PERIOD ( DATE ) AND TRANSACTIONTIME ; These statements should once again be self-explanatory. Adding bitemporal support to existing tables via ALTER TABLE is analogous to its validtime and transaction-time counterparts. We omit further discussion here.
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Statement Modifiers Are Flawed
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This brings us to the end of our brief overview of TSQL2 basics. In this section and the next three, we give our reasons for rejecting the TSQL2 approach, and indeed for seriously questioning its very motivation. Note: Those reasons are very similar to those that have previously been aired in the international standards and academic research communities, precisely because two of the authors of reference [6] (viz., Darwen and Lorentzos, respectively) have been at the forefront in articulating such objections in those communities. The goal of the present section is to demonstrate a number of logical problems with the basic idea of statement modifiers. In order to meet that goal, we present a series of simple examples that illustrate those problems. The examples are numbered for purposes of subsequent reference. Here then is the first example (a current query against versions of tables S and SP with let us assume valid-time support):12
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12. All of the examples in this section are based on a certain simple combination of a join, a restriction, and a projection. Consideration of examples involving something a little more complicated is left as an exercise.
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