import type { PgColumn } from './columns/index.js';
import type { Placeholder, SQL, SQLWrapper } from '../sql/sql.js';
export * from '../sql/expressions/index.js';
export declare function concat(column: PgColumn | SQL.Aliased, value: string | Placeholder | SQLWrapper): SQL;
export declare function substring(column: PgColumn | SQL.Aliased, { from, for: _for }: {
    from?: number | Placeholder | SQLWrapper;
    for?: number | Placeholder | SQLWrapper;
}): SQL;
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