UD Update Code

(a limit field)

ud=20000701

20000701 in ud

The UD field contains the date that the record was entered into the PsycINFO database in YYYYMMDD format. Records derived from sources published before 1927 all contain "19260101" as the update code. Search for a single date or search for a range of dates using the following operators:

< less than,

such as ud<20000701

> greater than,

such as ud>20000701

<= less than or equal to,

such as ud<=20000701

>= greater than or equal to,

such as ud>=20000701

- within a range,

such as ud=20000701-20000901

You can search using the field label (UD) or from the Update Code Index described below.

Browsing Update Codes

As an alternative to searching with the field label, you can browse dates and search for them directly from the Update Code Field-Specific Index. This field-specific index contains only codes drawn from the UD field, therefore, your search will always yield results. Search results display in the UD field.