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QSC-1: Segment Field Name (ST)

Definition: The name of the field that is participating as a qualifier (usually the "key"). Refer to Section 2.A.59.1, “Segment Field Name (ST),” for segment field name conventions.

QSC-2: Relational Operator (ID)

Definition: Refer to HL7 Table 0209 - Relational Operator for valid values.

QSC-3: Value (ST)

Definition: The value to which the field will be compared.

QSC-4: Relational Conjunction (ID)

Definition: Refer to HL7 Table 0210 - Relational Conjunction for valid values. The relational conjunction is defined as follows: If more than one comparison is to be made to select qualifying rows, a conjunction relates this repetition of the field to the next.

• When applied to strings, the relational operators LT, GT, LE, and GE imply an alphabetic comparison.

• A "generic" comparison selects a record for inclusion in the response when the beginning of the designated field matches the select string.

• Where a repeating field is specified as an operand, a match on any instance of that field qualifies the row for inclusion in the response message.

• AND takes precedence over OR. More sophisticated precedence rules require that the query be expressed as an embedded query language message or a stored procedure query message (see Chapter 5, "Query").