从一个表复制到另一个具有相同列数和名称的表

Question

I have the following two tables...

Table1
colA    colB    colC    
1       a       w    
2       b       w    
3       c       s        
4       b       g    
5       n         


Table2
colA    colB    colC    
1       w       f    
2       w       r    
3       s       g    

I want to copy from table1 to table2 using UPDATE query, the problem I have is I have to SET all column name in which I have 100 column for each table, But I have the same column count and name too.

what would be easy way to run query UPDATE in php?

is there some foreach thing out there might be...

Here is what I have now...

public function update($id){
            try {
                UPDATE table1 b 
                INNER JOIN connect c 
                ON c.ID = b.ID 
                INNER JOIN table2 a 
                ON a.ID_a = c.ID_a 
                SET b.colA = a.colA,
                b.colB = a.colB,
                b.colC = a.colC
                .
                .
                .
                .
                . coontinue here all column name..
                .
                .
                WHERE a.ID_a = '".$id."' ";
             } catch(PDOException $e) {
                 $e->getMessage();
            }
            return false;
        }

some idea please?

Answer 1

You don't need to do it via UPDATE syntax. You can use INSERT..SELECT :

INSERT INTO `table2` SELECT * FROM `table1`

this will works if you have exactly same structure in both tables. If not, you have to write column names (and map columns from first table to the second).

If you wand to replace corresponding values, then you should first delete present values:

DELETE FROM `table2` WHERE `colA` IN (SELECT `colA` FROM `table1`)

Answer 2

if you want to update data in first table use values in other table you can use next statement

UPDATE table_name AS t1 
SET t1.field_name = (SELECT field_name FROM other_table AS t2 WHERE t1.field=t2.field)