< Why cannot I update a value directly

match $n isa company, has ipo-date $p;
$p == 2025-01-01;
update $p == 2000-01-01;

match $n isa company, has ipo-date $p;
$p == 2025-01-01;
update $p == 2000-01-01;

[TQL0] [TQL03] TypeQL Error: There is a syntax error

parsing error: expected thing_constraint or relation

Near 3:10:

match $n isa company, has ipo-date $p;

$p == 2025-01-01;

--> update $p == 2000-01-01;

^

Caused: Error in usage of TypeQL.

[TSV7] Query parsing failed.

[HSR16] Transaction error.

[TQL0] [TQL03] TypeQL Error: There is a syntax error

parsing error: expected thing_constraint or relation

Near 3:10:

match $n isa company, has ipo-date $p;

$p == 2025-01-01;

--> update $p == 2000-01-01;

^

Caused: Error in usage of TypeQL.

[TSV7] Query parsing failed.

[HSR16] Transaction error.

match $n isa company, has ipo-date 2025-01-01;
update $n has ipo-date 2000-01-01;

match $n isa company, has ipo-date 2025-01-01;
update $n has ipo-date 2000-01-01;