SQL Server Operations in Query Execution Plan

Clustered Index Scan: Reads all the rows stored in a table stored as a clustered index.
Table Scan: Reads all the rows in table that is stored as a heap structure.
Clustered Index Seek: Traverses the tree structure of table stored as a clustered index to find the needed row(s).
Index Scan: Reads all of the key values of an index to find the matching data.
Index Seek: Traverses the tree structure of an index to find the matching index keys.

Nested Loops Join: For each value in the first data set, SQL Server loops through the second data set looking for matches.
Merge Join: Used to join two data sets that are already sorted using the same key. A row from each source is obtained. If the rows match, they are joined. If the rows don't match, the lower value row is discarded and a new row is obtained from that source.
Hash Match: A hashtable of the smaller data set is created, then SQL Server loops through the larger data set probing the hashtable for matching values. Used when two large datasets must be joined.

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