Control File Statements › IF Statement

IF Statement

The IF statement initiates conditional processing of control file statements. It is terminated by an END IF Statement.

The logical operators NOT, AND, and OR are evaluated in standard logical order—that is, NOT first, then AND, then OR. For example, in this statement:

SELECT IF NOT USERID EQ 'USER01' AND CUSTOMER EQ 'COMPANY1'
OR ACCOUNT EQ '50001000'.

• The NOT applies only to USERID EQ 'USER01'. It does not extend across the AND and OR parameters.
• The AND joins the two relations:
  • NOT USERID EQ 'USER01'
  • CUSTOMER EQ 'COMPANY1'

AND does not extend across the OR parameter.

• The OR joins:
  • NOT USERID EQ 'USER01' AND CUSTOMER EQ 'COMPANY1'
  • ACCOUNT EQ '50001000'

  OR can extend across either the NOT or the AND parameter.

• The selected records are those where the user ID is not USER01, and the customer is COMPANY1 or has an account number of 50001000.

You can include a maximum of 12 conditions on one IF statement.

When an alphanumeric field is compared with a literal, the comparison begins with the leftmost character of the literal and the first position of the field. If the literal is shorter than the field being tested, only the number of characters in the literal is compared. Trailing characters in the field are not compared.

Multiple IF statements with no intervening END IF statements are considered to have logical ORs between them. The syntax is as follows:

IF [NOT] cond1 [{OR|AND} [NOT] cond2] ...

NOT

Reverses the result of the conditional test.

cond1

Specifies that cond1 is required and must be in one of two formats. One format is described in the section Bit Test Statement. The other format is:

fldname1 relation fldname2

Indicates that fldname1 is a field name, fldname2 is a literal or field name, and relation is one of these logical relations:

• EQ equal to
• NE not equal to
• GT greater than
• LT less than

If fldname2 is a literal it must be enclosed in single quotation marks.

OR

Specifies that OR is required if another condition follows and AND is not used. OR is used to logically connect the conditions so that the statements between the IF and the END IF statements are executed if any of the conditions are true.

AND

Specifies that AND is required if another condition follows and OR is not used. AND is used to logically connect the conditions so that the statements between the IF and the END IF statements are executed if all of the conditions are true.

cond2

Specifies that cond2 defines an additional conditional expression in the same format as cond1. Up to 12 AND clauses or OR clauses may be specified.

Examples

This statement checks to see if the expiration date equals 10365:

IF EXPDT EQ '10365'.

This statement checks to see if the CA VM:Account record type is 01 or 03:

IF RECTYPE EQ '01' OR RECTYPE EQ '03'.