Odoo Domain Expressions use Reverse Polish Notation

This list will give you examples of usage of several operators

'like' operator

[('input', 'like', 'open')]

Returns case sensitive (wildcards - '%open%') search.

O/p: open, opensource, openerp, Odooopenerp

'not like' operator

[('input', 'not like', 'open')]

Returns results not matched with case sensitive (wildcards - '%open%') search.

O/p: Openerp, Opensource, Open, Odoo, odoo, OdooOpenerp


'=like' operator

'=like': [('name', '=like', 'open')]

Returns exact (= 'open') case sensitive search.

O/p: open


'ilike' operator

'ilike': [('name', 'ilike', 'open')]

Returns exact case insensitive (wildcards - '%open%') search.

O/p: Openerp, openerp, Opensource, opensource, Open, open, Odooopenerp, OdooOpenerp

'not like' operator
'not ilike': [('name', 'not ilike', 'open')]

Returns results not matched with exact case insensitive (wildcards - '%open%') search.

O/p: Odoo, odoo

'=ilike' operator
'=ilike': [('name', '=ilike', 'open')]

Returns exact (= 'open' or 'Open') case insensitive search.

O/p: Open, open

'=?' operator
'=?': name = 'odoo' parent_id = False [('name', 'like', name), ('parent_id', '=?', parent_id)]

Returns name domain result & True


name = 'odoo' parent_id = 'openerp' [('name', 'like', name), ('parent_id', '=?', parent_id)]
Returns name domain result & parent_id domain result


'=?' is a short-circuit that makes the term TRUE if right is None or False, '=?' behaves like '=' in other cases

'in', 'not in' operator
'in': [('value1', 'in', ['value1', 'value2'])] - in operator will check the value1 is present or not in list of right term

'not in': [('value1', 'not in', ['value2'])] - not in operator will check the value1 is not present in list of right term While these 

'in' and 'not in' works with list/tuple of values, the latter  '=' and '!=' works with string

'=', '!=' operators

'=': value = 10 [('value','=',value)] - term left side has 10 in db and term right our value 10 will match

'!=': value = 15 [('value','!=',value)] - term left side has 10 in db and term right our value 10 will not match

'child_of' operator

'child_of': parent_id = '1' #Agrolait 'child_of': [('partner_id', 'child_of', parent_id)]
return left and right list of partner_id for given parent_id

'<=', '<', '>', '>=' operators

'<=', '<', '>', '>=': These operators are largely used in openerp for comparing dates

[('date', '>=', date_begin), ('date', '<=', date_end)]. You can use these operators to compare int or float also.