Postgresql string contains substring how to#
Postgresql string contains substring manual#

Postgresql string contains substring how to#

(Vote for please, I'm just illustrating how to clearly explain - I hope - what you want to achieve, sample data, etc). I've looked at the documentation and in order to use the substring () functions I need to know the index position of the char where I want to start extraction, but the strings I'm working with are varying length. WHERE string_a LIKE ANY (SELECT '%'||candidate_str||'%' FROM tableB) The string concatenation operator () will accept non-string input, so long as at least one input is of string type, as shown in Table 9.9.For other cases, inserting an explicit coercion to text can be used to have non-string input accepted.

If so, shamelessly stealing excellent suggestion, you would use: SELECT string_a bork doesn't match any substring so it is not found. There is no need to show the substring(s) that matched.

Postgresql string contains substring manual#

I want the result set: the manual is greatīecause the manual is great has man and great in it and because chicken chicken chicken has chicken in it. ('the manual is great'), ('Chicken chicken chicken'), ('bork') Extracts the substring of string starting at the start 'th character if that is specified, and stopping after count characters if that is specified. Given: CREATE TABLE tableA (string_a text) substring ( string text FROM start integer FOR count integer ) text. Sn is a substring of Sa.Ī simple example to show what I mean (hint, hint): Sn from table B to find out if any of the other strings in S1. But obviously, this does not work, since the postgres thinks that tagname means a pattern containing the substring tagname instead of the actual.

I'm going to take a wild stab in the dark and assume you mean that you want to match a string Sa from table A against one or more other strings S1. How to find substring using results of subquery?ĬONSTRAINT uchastki_pkey PRIMARY KEY (fid),ĬONSTRAINT enforce_dims_the_geom CHECK (st_ndims(the_geom) = 2) I have a table and i want to find a string in one row (character varying datatype) of this table using substring (character varying datatype) returned by subquery: SELECT uchastki.kadnumīut get a error ERROR: more than one row returned by a subquery used as an expression