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The optimizer managed to turn the subquery approach into a simple join approach. If I hadn t created the dept table with the appropriate uniqueness constraint, the optimizer would still have managed to find the join by unnesting: Execution Plan (9.2.0.6 autotrace) ---------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=44 Card=10000 Bytes=770000) 1 0 HASH JOIN (Cost=44 Card=10000 Bytes=770000) 2 1 SORT (UNIQUE) 3 2 TABLE ACCESS (FULL) OF 'DEPT' (Cost=2 Card=3 Bytes=15) 4 1 TABLE ACCESS (FULL) OF 'EMP' (Cost=35 Card=20000 Bytes=1440000) In a very slight variation, 8i would have inserted one extra line to the plan, between the hash join and the sort, identifying the inline view from the unnest as vw_nso_1. If we had then blocked the unnesting (with the no_unnest hint), the optimizer would have fallen back to the filter mechanism: Execution Plan (9.2.0.6 autotrace) ---------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=47 Card=3333 Bytes=239976) 1 0 FILTER 2 1 TABLE ACCESS (FULL) OF 'EMP' (TABLE) (Cost=35 Card=20000 Bytes=1440000) 3 1 TABLE ACCESS (FULL) OF 'DEPT' (TABLE) (Cost=2 Card=1 Bytes=5) There is still one remaining option that the optimizer could play: the semi-join a mechanism reserved exclusively for existence tests. Wait a moment, you say, this query doesn t have an existence test it has an in subquery. But an in can always be transformed into an exists, and once it has been transformed, the optimizer may choose to use a semi-join on it and that semi-join could be a nested loop, merge, or hash semi-join. When hinted, these are the plans we get from 8i and 9i: Execution Plan (9.2.0.6 autotrace with nl_sj hint in subquery) ----------------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=40035 Card=10000 Bytes=770000) 1 0 NESTED LOOPS (SEMI) (Cost=40035 Card=10000 Bytes=770000) 2 1 TABLE ACCESS (FULL) OF 'EMP' (Cost=35 Card=20000 Bytes=1440000) 3 1 TABLE ACCESS (FULL) OF 'DEPT' (Cost=2 Card=2 Bytes=10) Execution Plan (9.2.0.6 autotrace with merge_sj hint in subquery) ---------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=282 Card=10000 Bytes=770000) 1 0 MERGE JOIN (SEMI) (Cost=282 Card=10000 Bytes=770000) 2 1 SORT (JOIN) (Cost=274 Card=20000 Bytes=1440000) 3 2 TABLE ACCESS (FULL) OF 'EMP' (Cost=35 Card=20000 Bytes=1440000) 4 1 SORT (UNIQUE) (Cost=8 Card=3 Bytes=15) 5 4 TABLE ACCESS (FULL) OF 'DEPT' (Cost=2 Card=3 Bytes=15) generate, create barcodes colored none on c# projects BusinessRefinery.com/ barcodesuse birt reports barcode implementation to make bar code in java activate BusinessRefinery.com/ barcodesquery out of multiple SQL statements written in the query window, unlike other RDBMSs. This behavior is shown in the Figure 6-3, in which we have selected a particular statement. Click the Execute button, and SQL Server will process only the selected statement. use .net winforms bar code printing to produce barcode with visual basic forms BusinessRefinery.com/ barcodesbarcode rdlc c# generate, create barcode dimensional none with .net projects BusinessRefinery.com/ bar codeare public they have the same accessibility as the type definition. This is a useful default because it corresponds to the common situation where internal implementation details are fully private and published constructs are available widely, and because omitting accessibility annotations makes code more readable in the common case. When you start to add more specific accessibility annotations, such as by making individual members internal or private, then it s useful to explicitly mark all members with accessibility annotations. Doing so makes your code more readable because readers don t have to remember that unmarked members are public. You can leave the remaining let bindings unmarked and implicitly private. In short, we recommend that if you mark any members of a type with accessibility annotations, you should mark them all. generate, create bar code browser none with visual basic.net projects BusinessRefinery.com/ bar codeworking barcodes .net use .net vs 2010 barcodes creation to encode barcodes on .net tiff BusinessRefinery.com/ bar codeCHAPTER 3 s WEB FORMS WITH ASP.NET
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