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Misc.

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robocop 2013-05-21 21:43:39 +00:00
parent d9544fc5b9
commit 96875db92e
2 changed files with 4 additions and 4 deletions
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2
doc/sql.extensions/README.substring_similar.txt
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@ -14,7 +14,7 @@ Author:
Syntax:
<regular expression substring> ::=
SUBSTRING(<value> FROM <similar pattern> ESCAPE <escape character>
SUBSTRING(<value> FROM <similar pattern> ESCAPE <escape character>)
<similar pattern> ::= <character value expression: substring similar expression>

6
doc/sql.extensions/README.window_functions.txt
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@ -147,10 +147,10 @@ Syntax:
ROW_NUMBER()
The rank functions compute the ordinal rank of a row within the window partition. In this category
is the functions: DENSE_RANK, RANK and ROW_NUMBER.
are the functions: DENSE_RANK, RANK and ROW_NUMBER.
With these functions, one can create different type of incremental counters. Think about
SUM(1) OVER (ORDER BY SALARY), these functions does this type of thing, but all of them in different
SUM(1) OVER (ORDER BY SALARY), these functions do this type of thing, but all of them in different
ways. Following is an example query, also comparing with the SUM behavior.
select
@ -223,7 +223,7 @@ NTH_VALUE gets the n-th value, starting from the first (default) or the last rec
ordered partition. If offset is 1 from first, it's equivalent to FIRST_VALUE. If offset is 1 from
last, it's equivalent to LAST_VALUE.
LAG and LEAD gets the value within a distance respect to the current row and the offset (which
LAG and LEAD get the value within a distance respect to the current row and the offset (which
defaults to 1) passed. In the case the offset points to outside of the partition, the default
parameter (which defaults to NULL) is returned. LAG looks for a preceding row, and LEAD for a
following row.