What does the decimal point in a MySQL query mean,

I see that there is a select G.name SUM (og.names_number) as Names_number; this g. What do you mean, why there is a decimal point ah, there is no g in the table

Reply to discussion (solution)

. The previous q indicates the table name or the workspace (alias), and you've pasted the instructions.

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

G represents the alias of the table, if the table name is long can be replaced by an alias,

Library name. Table name. Field Name
That's the whole story.

Look for the whole sentence there is no as g, if there is, G is the alias. G.name is the Name field in the data for this alias.
For example
Select G.name,c.name from table1 as G, table2 as C

If not, then G could be a database name
Select G.name from table

Oh it's an alias, so what's the definition of this alias, as G?

As can default

Select g.* from Tbl_name as G
Select g.* from Tbl_name g

It's all possible.

Okay, thank you, it's a knot.

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