Incorrect table definition; there can be only one auto column and it must be defined as a key

Question

I keep getting error while migrating in Laravel

[PDOException] SQLSTATE[42000]: Syntax error or access violation: 1075 Incorrect table definition; there can be only one auto column and it must be defined as a key

Code

public function up()
    {
        Schema::create('inventories', function($table){

            $table->engine = 'InnoDB';

            $table->increments('id')->unsigned();
            $table->string('sku',255);
            $table->string('description', 255 )->nullable;
            $table->tinyInteger('stock',5)->nullable()->unsigned();
            $table->tinyInteger('day_of_week',1)->unsigned();
            $table->text('note')->nullable();

            $table->timestamps();

        });

    }

You don't have to call unsigned(). increments() does that already. However I doubt this causes the error... — lukasgeiter

Sturm Sturm · Accepted Answer · 2015-02-05T22:40:10

/**
 * Create a new tiny integer column on the table.
 *
 * @param  string  $column
 * @param  bool  $autoIncrement
 * @param  bool  $unsigned
 * @return \Illuminate\Support\Fluent
 */
public function tinyInteger($column, $autoIncrement = false, $unsigned = false)
{
    return $this->addColumn('tinyInteger', $column, compact('autoIncrement', 'unsigned'));
}

This is the tinyInteger() function from Blueprint.php. As you can see it expects a boolean parameter here. It looks like you're trying to add a argument for size. You cannot specify the size of tinyint in Laravel.

    $table->engine = 'InnoDB';

    $table->increments('id');
    $table->string('sku',255);
    $table->string('description', 255 )->nullable();
    $table->tinyInteger('stock')->nullable()->unsigned();
    $table->tinyInteger('day_of_week')->unsigned();
    $table->text('note')->nullable();

This works fine.

Incorrect table definition; there can be only one auto column and it must be defined as a key

3 Answers