How count of 1 works

how count(1) works.
eg:
select count(1) from table_name;

Hi,
887274 wrote:
how count(1) works.It works the same way that COUNT always works.
eg:
select count(1) from table_name;COUNT (x) returns the number of rows on which x is not NULL.
Since 1 is never NULL,
SELECT  COUNT (1)
FROM    table_name;tells how many rows are in table_name, the same as COUNT (*).

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