Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
1.3k views
in Technique[技术] by (71.8m points)

postgresql - biginteger array functions

Are there any available functions for work with big integers?

I've found a module intarray, but functions from this module only work with integer, not bigint.

I miss a function for removing an item from an array. Something like the implementation of a "minus" operator in mentioned module:

int[] - int (remove entries matching right argument from array)

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

Updated 2015 with a better version.
You can substitute your own function. This one is reasonably fast:

CREATE OR REPLACE FUNCTION arr_subtract(int8[], int8[])
  RETURNS int8[] AS
$func$
SELECT ARRAY(
    SELECT a
    FROM   unnest($1) WITH ORDINALITY x(a, ord)
    WHERE  a <> ALL ($2)
    ORDER  BY ord
    );
$func$  LANGUAGE sql IMMUTABLE;

Call:

SELECT arr_subtract('{3,5,6,7,8,9}':: int8[], '{3,4,8}'::int8[]);

Result:

{5,6,7,9}

Keeps the original order of the array.

Related:


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...