Difference between revisions of "TSQL Execution Plan"
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=== Nested loops === | === Nested loops === | ||
For each row in the top (outer) input, scan the bottom (inner) input, and output matching rows. | For each row in the top (outer) input, scan the bottom (inner) input, and output matching rows. | ||
| + | |||
| + | === Merge join === | ||
| + | Match rows from two suitably sorted input tables and exploit sort order. | ||
Revision as of 10:25, 6 April 2012
Contents
Hash Match
use each row from the top input to build a hash table, and each row from the bottom input to probe into the hash table, outputting all matching rows.
Clustered Index Scan
Scanning a clustered index, entirely or only a range.
Compute scalar
Compute new values from existing values in a row
Stream aggregate
Compute summary values for groups of rows in a suitably sorted stream.
Sort
Sort the input
Nested loops
For each row in the top (outer) input, scan the bottom (inner) input, and output matching rows.
Merge join
Match rows from two suitably sorted input tables and exploit sort order.
