Basic DELETE commands in PostgreSQL detecting value as column name [duplicate] - postgresql

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delete "column does not exist"
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SQL domain ERROR: column does not exist, setting default
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I'm trying to delete a row at PostgreSQL using pgAdmin4.
Here is my command:
DELETE FROM commissions_user
WHERE first_name = "Steven";
For some reason, the error states that
ERROR: column "Steven" does not exist
LINE 2: WHERE first_name = "Steven";
^
SQL state: 42703
Character: 50
It's weird, why is "Steven" detected as a column name, shouldn't the column name be first_name?

Answer 1

Use single quotes instead
DELETE FROM commissions_user
WHERE first_name = 'Steven';
Double quotes can be used table and column, and single quotes can be used for strings.
ex.
DELETE FROM "commissions_user"
WHERE "first_name" = 'Steven';

Answer 2

https://www.postgresql.org/docs/current/sql-syntax-lexical.html
Double quote:
A convention often used is to write key words in upper case and names
in lower case, e.g.:
UPDATE my_table SET a = 5;
There is a second kind of identifier: the delimited identifier or
quoted identifier. It is formed by enclosing an arbitrary sequence of characters in double-quotes ("). A delimited identifier
is always an identifier, never a key word. So "select" could be used
to refer to a column or table named “select”, whereas an unquoted
select would be taken as a key word and would therefore provoke a
parse error when used where a table or column name is expected. The
example can be written with quoted identifiers like this:
UPDATE "my_table" SET "a" = 5;
Single Quote:
https://www.postgresql.org/docs/current/sql-syntax-lexical.html#SQL-SYNTAX-STRINGS
A string constant in SQL is an arbitrary sequence of characters
bounded by single quotes ('), for example 'This is a string'. To
include a single-quote character within a string constant, write two
adjacent single quotes, e.g., 'Dianne''s horse'. Note that this is not
the same as a double-quote character (")