vendor/illuminate/database/Schema/Grammars/PostgresGrammar.php

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<?php

namespace Illuminate\Database\Schema\Grammars;

use Illuminate\Support\Fluent;
use Illuminate\Database\Schema\Blueprint;

class PostgresGrammar extends Grammar
{
    /**
     * If this Grammar supports schema changes wrapped in a transaction.
     *
     * @var bool
     */
    protected $transactions = true;

    /**
     * The possible column modifiers.
     *
     * @var array
     */
    protected $modifiers = ['Collate', 'Increment', 'Nullable', 'Default'];

    /**
     * The columns available as serials.
     *
     * @var array
     */
    protected $serials = ['bigInteger', 'integer', 'mediumInteger', 'smallInteger', 'tinyInteger'];

    /**
     * The commands to be executed outside of create or alter command.
     *
     * @var array
     */
    protected $fluentCommands = ['Comment'];

    /**
     * Compile the query to determine if a table exists.
     *
     * @return string
     */
    public function compileTableExists()
    {
        return "select * from information_schema.tables where table_schema = ? and table_name = ? and table_type = 'BASE TABLE'";
    }

    /**
     * Compile the query to determine the list of columns.
     *
     * @return string
     */
    public function compileColumnListing()
    {
        return 'select column_name from information_schema.columns where table_schema = ? and table_name = ?';
    }

    /**
     * Compile a create table command.
     *