![]() ![]() So this call can be converted to INSTR with 2 parameters in PostgreSQL:įor more information, see Oracle to PostgreSQL Migration. Strings in this context include values of all the types character, character varying, and text. 4 parameters are specified, but 3rd and 4th have default values SELECT INSTR ( 'abcbcb', 'b', 1, 1 ) FROM dual This section describes functions and operators for examining and manipulating string values. In this case the user-defined function is not required and POSITION function with 2 parameters can be used in PostgreSQL: Find 2nd occurrence of substring in string starting from 3 position SELECT INSTR4 ( 'abcbcb', 'b', 3, 2 ) Īlso some Oracle code can use INSTR function with 4 parameters, but 3rd and 4th parameters having values of 1. So now you can use this user-defined function for INTR with 4 parameters in PostgreSQL: The required occurrence found IF v_found = 1 THEN Nothing found IF v_pos IS NULL OR v_pos = 0 THEN RETURN v_pos P_start INT, p_occurrence INT ) RETURNS integer AS $$ In PostgreSQL you have to use an user-defined function to find the Nth occurrence of substring:ĬREATE OR REPLACE FUNCTION instr4 (p_str VARCHAR, p_substr VARCHAR , Strings can be for example 'AXXX' 'ABXXX' 'ABCXXXX', so the extracted substrings should be like 'A' 'AB' 'ABC'. Find 2nd occurrence of substring in string starting from 3 position SELECT INSTR ( 'abcbcb', 'b', 3, 2 ) FROM dual 21 In my SQL statement I have to extract a substring from a string at the character ''. INSTR with 4 parameters starts searching the specified substring from the specified position and returns the position of the specified occurrence of string: ![]()
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