What does the decimal point in mysql Query mean,

What does the decimal point in mysql Query mean? I think some of them write select g. name SUM (og. names_number) as names_number; this g. why is there a decimal point? there is no g in the table?

Reply to discussion (solution)

. The preceding q indicates the table name or workspace (alias). you have pasted all the instructions.

Select g. id, g. name from table as g

G indicates the table alias. if the table name is long, it can be replaced by an alias,

Database name. table name. field name
Complete Writing is like this.

Find out if there is any as g in the entire sentence. If yes, g is the alias. G. name is the name field in the data of this alias.
For example
Select g. name, c. name from table1 as g, table2 as c

If not, g may be the database name.
Select g. name from table

Oh, it's an alias. how is this alias defined? is it AS g?

As can be default

Select g. * from tbl_name as g
Select g. * from tbl_name g

Yes.

Okay. thank you. you have fixed it.