What does “select count(1) from table_name” on any database tables mean?

核能气质少年 提交于 2019-11-29 19:13:48

The parameter to the COUNT function is an expression that is to be evaluated for each row. The COUNT function returns the number of rows for which the expression evaluates to a non-null value. ( * is a special expression that is not evaluated, it simply returns the number of rows.)

There are two additional modifiers for the expression: ALL and DISTINCT. These determine whether duplicates are discarded. Since ALL is the default, your example is the same as count(ALL 1), which means that duplicates are retained.

Since the expression "1" evaluates to non-null for every row, and since you are not removing duplicates, COUNT(1) should always return the same number as COUNT(*).

Here is a link that will help answer your questions. In short:

count(*) is the correct way to write it and count(1) is OPTIMIZED TO BE count(*) internally -- since

a) count the rows where 1 is not null is less efficient than
b) count the rows

Difference between count(*) and count(1) in oracle?

count(*) means it will count all records i.e each and every cell BUT

count(1) means it will add one pseudo column with value 1 and returns count of all records

ChrisHDog

This is similar to the difference between

SELECT * FROM table_name and SELECT 1 FROM table_name.  

If you do

SELECT 1 FROM table_name

it will give you the number 1 for each row in the table. So yes count(*) and count(1) will provide the same results as will count(8) or count(column_name)

There is no difference.

COUNT(1) is basically just counting a constant value 1 column for each row. As other users here have said, it's the same as COUNT(0) or COUNT(42). Any non-NULL value will suffice.

http://asktom.oracle.com/pls/asktom/f?p=100:11:2603224624843292::::P11_QUESTION_ID:1156151916789

The Oracle optimizer did apparently use to have bugs in it, which caused the count to be affected by which column you picked and whether it was in an index, so the COUNT(1) convention came into being.

Thilo
SELECT COUNT(1) from <table name>

should do the exact same thing as

SELECT COUNT(*)  from <table name>

There may have been or still be some reasons why it would perform better than SELECT COUNT(*)on some database, but I would consider that a bug in the DB.

SELECT COUNT(col_name) from <table name>

however has a different meaning, as it counts only the rows with a non-null value for the given column.

in oracle i believe these have exactly the same meaning

Vikas Kumar

You can test like this:

create table test1(
 id number,
 name varchar2(20)
);

insert into test1 values (1,'abc');
insert into test1 values (1,'abc');

select * from test1;
select count(*) from test1;
select count(1) from test1;
select count(ALL 1) from test1;
select count(DISTINCT 1) from test1;

Depending on who you ask, some people report that executing select count(1) from random_table; runs faster than select count(*) from random_table. Others claim they are exactly the same.

This link claims that the speed difference between the 2 is due to a FULL TABLE SCAN vs FAST FULL SCAN.

易学教程内所有资源均来自网络或用户发布的内容,如有违反法律规定的内容欢迎反馈
该文章没有解决你所遇到的问题?点击提问,说说你的问题,让更多的人一起探讨吧!