Dynamically assign alias to all the field names in msyql query

Question

I have 2 tables in mysll DB. Both tables have few fixed and few dynamic columns (Fields / Schema). I want to join both these tables with following query:

SELECT          


        

Answer 1

You would need to query the information_schema to get the column names of that two tables. Lets assume You would have the cd column names stored in the array $cd_columns and the cd_n column names in the array $cdn_columns.

Then in PHP when creating the query loop through the column arrays and do something like this:

$sql = 'SELECT ';

// add the cd columns
$i = 0;
foreach($cd_columns as $col) {
    $sql .= "{$col} AS CD_Column{$i},";
    $i++;
}

// add the cd_n columns
$i = 0;
foreach($cdn_columns as $col) {
    $sql .= "{$col} AS CN_Column{$i},";
    $i++;
}

// remove the trailing comma
$sql = trim($sql, ',');
// continue the SQL
$sql .= ' FROM ...';

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