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To prevent nasty things from happening to your data, your database server performs a number of checks on the operations that you throw at it before it accepts them as valid and enables them to insert, modify, or delete data To make operations as fast as possible, your database server performs the easiest and fastest checks before it tries the more difficult and slower checks This makes sense, because as soon as your database server performs a check that fails, it can totally disregard all the other checks and return an error as quickly as possible The first checks that your server performs are data-type checks, which are the very simplest and, therefore, the fastest If you attempt to place a string into a numeric column, for example, the data-type check on that column fails, and the database server can stop processing at that point and return an error message.

The server doesn t need to waste precious CPU time processing the other checks, because it already knows that the SQL statement must not proceed The next checks to be performed are the check constraints placed on the individual columns, such as a range check that permits only values between zero and 100 (These constraints are covered in more detail in 8) After these simple checks pass muster, next come the referential-integrity constraint checks (also covered in 8) After all checks have succeeded, the database server clears the way for the SQL statement to be processed If your trigger is defined to execute before the triggering SQL statement is executed (and some database products enable you to do so), the trigger code executes at this point in the sequence, and then the SQL statement runs.

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1.3.2 More rigorous Debye-Hiickel treatment of the activity coefficient A more rigorous approach requires integration of Eq. (1.3.13) not over the whole volume of the solution but over the effective volume after the volume of the central ion has been excluded, as this region is not accessible for the ionic atmosphere. Thus, integration is carried out from r = ay i.e. from the distance of closest approach, equal to the effective ion diameter, which is the smallest mean distance to which the centres of other ions can approach the central ion. This value varies for various electrolytes (Table 1.3). In this refined procedure the integration constant appearing in Eq. (1.3.13) attains the value kx = [zkel4ne{\ + KO)\ exp {KO) and the potential \pk = zke/4jt [r(l + Ka)]'1 exp [ic(a r)]. This expression can again be separated into the contribution of the isolated central ion ip k and the contribution of the ionic atmosphere tya. As a result of the principle of linear field superposition, these two quantities can be added algebraically. The contribution of the

If your trigger is defined to execute after the triggering SQL statement is executed, the SQL statement runs first, and then the trigger code executes Now ask yourself: Why would you want to execute any part of a trigger if the underlying SQL statement that triggered it failed Well, because the triggering event never really happened (it failed), the failure of the trigger code to execute seems a logical outcome as well What if the triggering SQL statement succeeds, but the trigger code that it fires fails Wouldn t you want to keep the effects of the triggering SQL statement and just handle the failed trigger in some other way The answer becomes clear if you consider the fact that a trigger is a database object and, as such, is a formally defined part of the database design itself.

Because a trigger is defined to execute whenever its triggering event occurs, you would be working against the very design of the database by enabling the effects of an SQL statement to be committed to disk without also demanding that the effects of the trigger that it was supposed to fire be committed as well For this reason, both the trigger and any SQL statement that triggers it are considered part of the same transaction If any part of either the trigger code or the underlying SQL statement that triggers it fails, the entire sequence of events is rolled back as a single unit of work, and your data looks as if nothing ever happened.

The question remains: How can you eliminate the sounds from both the left and right channels from the center channel Also, it would be great if you could get a signal containing L and R without C, maintaining the stereo separation. Luckily, a solution does exist, in the form of . . . (drum roll please) . . .

Remember that the trigger is an implicit transaction because the fact that it is a transaction is implied by the nature of how the trigger is used, and that an explicit transaction is explicitly declared through programming statements A trigger is considered an implicit transaction for.

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