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SQLite Query Language: Aggregate Functions

The aggregate functions shown below are available by default Additional aggregate functions written in C may be added using the sqlite3_create_function() API In any aggregate function that takes a single argument, that argument can be preceded by the keyword DISTINCT...

Create Or Redefine SQL Functions - SQLite Home Page

int sqlite3_create_function( sqlite3 *db, const char *zFunctionName, int nArg, int eTextRep, void *pApp, void (*xFunc)(sqlite3_context*,int,sqlite3_value**), void ....

The Aggregate Magic Algorithms

The Aggregate Magic Algorithms There are lots of people and places that create and collect algorithms of all types (here are a few sites)Unfortunately, in building systems hardware and software, we in The Aggregate often have found it necessary to do relatively obscure low-level things very efficiently Many of the tricks we've devised or collected either require assembly language coding ....

Trigram Wildcard String Search in SQL Server ,

Since this test was performed on SQL Server 2016 (loading a heap table, under database compatibility level 130, and with a TABLOCK hint), the plan benefits from parallel insertRows are distributed between threads by the parallel scan of the Example table, and remain on the same thread thereafter (no repartitioning exchanges)...

Day Number of Year, Power Query Custom Function | RADACAD

The result is a list of month numbers as below: Generator Function used in above code is ListNumbers this function generate list of numbers starting from a value...

Null (SQL) - Wikipedia

Since Null is not a member of any data domain, it is not considered a "value", but rather a marker (or placeholder) indicating the absence of valueBecause of this, comparisons with Null can never result in either True or False, but always in a third logical result, Unknown The logical result of the expression below, which compares the value 10 to Null, is Unknown:...

Using Pipelined and Parallel Table Functions - Oracle

Pipelined Table Functions with REF CURSOR Arguments A pipelined table function can accept any argument that regular functions accept A table function that accepts a REF CURSOR as an argument can serve as a transformation function That is, it can use the REF CURSOR to fetch the input rows, perform some transformation on them, and then pipeline the results out (using either the interface ....