The implicit conversion of "char to number" or "number of char".

CREATE TABLE test_table
(
NUM NUMBER,
VCH VARCHAR2 (10)
);

INSERT INTO table_test VALUES
(1, '1') ;

INSERT INTO table_test VALUES
(2, '2') ;

SELECT * FROM test_table WHERE vch = 1;

When comparing, what type of data is converted into what - all vch values are converted in number or 1 is converted to char '1'?

Hello

Welcome to the forum!

The answer to your question is in the predicate explain plan section:

filter predicates: to_number ("VCH") = 1

Best regards
Nikolai

Tags: Database

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