mysql - How to insert a row to table with another table's row and an variable? -

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there 2 table: 

a: col1, col2   b: col3, col4

i want insert row table a, col2 selected table b's col3, col1 variable, how should this?

i'm considered sql: 

 insert a(col1, col2) select ?, col3 b col4=?

, troubled variable.

try this

declare @variable_name int;  set @variable_name= your_value;   insert a(col1, col2) select @variable_name, col3 b col4=[your_condition]

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