code: function eqv (column, value) {
      if (this.typecheck) t.typecheck('eqv', [column, value]);
      if (value===undefined||value===null) value = null;
      if ('string'===typeof value) value = this.string(value);
      if ('boolean'===typeof value)
          value = (this.dialect == 'pg')
              ? ((value == false) ? this.wrap('f') : this.wrap('t'))
              : ((value == false) ? 0 : 1);
  
      return column+'='+value;
  }
docs: col = val