('where t1.title like ''%''||split_part(substring(log. If the pattern contains any parentheses, the substring function returns the text that matches the first parenthesized subexpression. ('from t1 left join t2 on t1.title = substring(log.path from 6) '), SQL defines some string functions that use key words, rather than commas, to separate arguments. Because the position is 2, the function returns the 2 nd substring which is ‘B’. ('select t1.title, count(t2.path) as num '), Binary String Functions and Operators This section describes functions and operators for examining and manipulating values of type bytea. Examples See the following statement: SELECT SPLITPART ( 'A,B,C', ',', 2 ) Code language: JavaScript (javascript) The string 'A,B,C' is split on the comma delimiter (,) that results in 3 substrings: ‘A’, ‘B’, and ‘C’. ('I''m very new to this, if you have a better approach altogether I would appreciate any suggestions'), ('Course of action: parse t2.path so that it looks like t1.title in order to do a left join and count'), ('GOAL: FOR EACH t1.title COUNT THE NUMBER OF TIMES IT SHOWS UP IN t2'), ('t2 has a path column with paths separated by dashes and prefixed ''path/'''), ('t1 has a title column with titles separated by spaces.'), I've also looked at splitpart () and that only returns one word. PostgreSQL 9.4, PostgreSQL 9.3, PostgreSQL 9.2, PostgreSQL 9.1, PostgreSQL 9.0, PostgreSQL 8.4 Example Lets look at some PostgreSQL substring function examples and explore how to use the substring function in PostgreSQL. The string argument states which string we have used to split using a splitpart function in PostgreSQL. The splitting of the string is based on the specified delimiter. See the following examples: SELECT SUBSTRING ( 'PostgreSQL', 1, 8 ) - PostgreS SELECT SUBSTRING ( 'PostgreSQL', 8 ) - SQL Code language: SQL (Structured Query Language) (sql) In the first statement, we extract a substring that has length of 8 and it is started at the first character of the PostgreSQL string. ('How to left join and count two tables where the rows (strings) are different'), 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. This function splits a string using a specified delimiter and returns the nth substring. Slightly bigger example, which includes examples of handling apostrophes in string literals (the sentences have been taken from another question): create table sentences ( s varchar(128) ) Use a regular expression, like so: select substring('hello everyone out there somewhere', '+++++')
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