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USING (SELECT fragment, SUM(sign) AS cnt FROM @changes GROUP BY fragment HAVING SUM(sign) <> 0) AS d ON fs.fragment = d.fragment WHEN MATCHED AND fs.cnt + d.cnt > 0 THEN UPDATE SET cnt = fs.cnt + d.cnt WHEN MATCHED THEN DELETE WHEN NOT MATCHED BY TARGET THEN INSERT (fragment, cnt) VALUES(d.fragment, d.cnt); go

The trigger starts with two quick exits. At B we handle the case that the statement did not affect any rows at all. In the case of an UPDATE operation, we don t want the trigger to run if the user updates some other column, and this is taken care of at C. Observe that we cannot use a plain IF UPDATE, as the trigger then would exit directly on any DELETE statement. Thus, the condition on IF UPDATE is only valid if there are also rows in the virtual table inserted. At D we get the changes caused by the action that fired the trigger. Inserted fragments get a weight of 1 and deleted fragments get a weight of -1. If a fragment appears both in the new and old email addresses, the sum will be 0, and we can ignore it. Otherwise we insert a row into the table variable @changes. Next at E we use this table variable to insert and delete rows in the fragments_persons table. In SQL 2008, we can conveniently use a MERGE statement, whereas in the SQL 2005 version, there is one INSERT statement and one DELETE statement. Finally, at F we also update the fragments_statistics table. Because this is only a statistics table, this is not essential, but it s a simple task especially with MERGE in SQL 2008. In SQL 2005, this is one INSERT, UPDATE, and DELETE each. To test the trigger you can use the script in the file 06_map_trigger.sql. The script performs a few INSERT, UPDATE, and DELETE statements, mixed with some SELECT statements and invocations of map_search_five to check for correctness.

open location (choose URL showing File servers)

logic (TTL) gate In this gate, two NPN bipolar transistors are used Note that one of the transistors has two emitters

Connect to the server using the DAC. Use a query window to connect to yourservername by using ADMIN:yourservername in the server name section (or use the sqlcmd command-prompt utility with the -A switch). Execute the script:

SELECT OBJECT_DEFINITION ( OBJECT_id('sys.sp_MSrepl_helparticlecolumns') )

Figure 8-26 Without any parameters, the choose URL command displays available file servers on your network

Metal-Oxide-Semiconductor Logic Digital ICs can also be constructed using metal-oxide-semiconductor (MOS) devices N-channel MOS (NMOS) logic, pronounced EN-moss logic, offers simplicity of design, along with high operating speed P-channel MOS logic, pronounced PEA-moss logic, is similar to NMOS logic, but the speed is slower An NMOS or PMOS digital IC is like a circuit that uses only N-channel MOSFETs, or only P-channel MOSFETs, respectively Complementary-metal-oxide-semiconductor (CMOS) logic, pronounced SEA-moss logic, employs both N-type and P-type silicon on a single chip This is analogous to using both N-channel

You should find the procedure text returned as expected, and if you are on a production system, don t forget to close the DAC connection when you are done with it!

8:

When we look in BOL at the definition of a replication stored procedure or a replication agent, we find that the permitted values for the parameters are all clearly listed. But it occasionally becomes apparent that there are other acceptable values that have never been documented. The exact number of these hidden parameters is something we ll never know, and in all cases they will be unsupported for the general public. Even so, sometimes they start being used and recommended prior to documentation, usually in order to fix a bug. A case in point is the sp_addpublication procedure, in which there is now the acceptable value of database snapshot for the @sync_method.