InterSystems IRIS Data Platform 2020.4 > Class Reference > %SYS namespace > INFORMATION.SCHEMA.CONSTRAINTCOLUMNUSAGE

INFORMATION.SCHEMA.CONSTRAINTCOLUMNUSAGE

persistent class INFORMATION.SCHEMA.CONSTRAINTCOLUMNUSAGE extends %Library.Persistent

SQL Table Name: INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE

Returns one row for each column for each CHECK, UNIQUE, PRIMARY KEY, FOREIGN KEY constraint, or assertion in the current namespace for tables that can be accessed by the current user in the current namespace. The rows list the columns that constitute each unique constraint, and the referencing columns in each foreign key constraint. Since InterSystems IRIS does not currently support CHECK constraints or assertions, CONSTRAINT_COLUMN_USAGE returns the same rows as KEY_COLUMN_USAGE

Property Inventory

Parameters

parameter READONLY = 1;
Inherited description: READONLY = 1 means that objects can be created, opened but not saved or deleted. Tables are projected to SQL as READONLY.

Properties

property COLUMNNAME as %String (COLLATION = "Upper", MAXLEN = 128) [ SqlFieldName = COLUMN_NAME , Required ];
Name of the column.
Property methods: COLUMNNAMEDisplayToLogical(), COLUMNNAMEGet(), COLUMNNAMEIsValid(), COLUMNNAMELogicalToDisplay(), COLUMNNAMELogicalToOdbc(), COLUMNNAMENormalize(), COLUMNNAMESet()
property CONSTRAINTCATALOG as %String (MAXLEN = 128) [ Calculated , SqlFieldName = CONSTRAINT_CATALOG ];
Table qualifier - always NULL in InterSystems IRIS.
Property methods: CONSTRAINTCATALOGCompute(), CONSTRAINTCATALOGDisplayToLogical(), CONSTRAINTCATALOGGet(), CONSTRAINTCATALOGIsValid(), CONSTRAINTCATALOGLogicalToDisplay(), CONSTRAINTCATALOGLogicalToOdbc(), CONSTRAINTCATALOGNormalize(), CONSTRAINTCATALOGSQLCompute()
property CONSTRAINTNAME as %String (COLLATION = "Upper", MAXLEN = 128) [ SqlFieldName = CONSTRAINT_NAME , Required ];
Name of the constraint.
Property methods: CONSTRAINTNAMEDisplayToLogical(), CONSTRAINTNAMEGet(), CONSTRAINTNAMEIsValid(), CONSTRAINTNAMELogicalToDisplay(), CONSTRAINTNAMELogicalToOdbc(), CONSTRAINTNAMENormalize(), CONSTRAINTNAMESet()
property CONSTRAINTSCHEMA as %String (COLLATION = "Upper", MAXLEN = 128) [ Calculated , SqlFieldName = CONSTRAINT_SCHEMA ];
Name of schema that contains the constraint. Always the same as the TABLE_SCHEMA.
Property methods: CONSTRAINTSCHEMACompute(), CONSTRAINTSCHEMADisplayToLogical(), CONSTRAINTSCHEMAGet(), CONSTRAINTSCHEMAIsValid(), CONSTRAINTSCHEMALogicalToDisplay(), CONSTRAINTSCHEMALogicalToOdbc(), CONSTRAINTSCHEMANormalize(), CONSTRAINTSCHEMASQLCompute()
property TABLECATALOG as %String (MAXLEN = 128) [ Calculated , SqlFieldName = TABLE_CATALOG ];
Table qualifier - always NULL in InterSystems IRIS.
Property methods: TABLECATALOGCompute(), TABLECATALOGDisplayToLogical(), TABLECATALOGGet(), TABLECATALOGIsValid(), TABLECATALOGLogicalToDisplay(), TABLECATALOGLogicalToOdbc(), TABLECATALOGNormalize(), TABLECATALOGSQLCompute()
property TABLENAME as %String (COLLATION = "Upper", MAXLEN = 128) [ SqlFieldName = TABLE_NAME , Required ];
Name of the table.
Property methods: TABLENAMEDisplayToLogical(), TABLENAMEGet(), TABLENAMEIsValid(), TABLENAMELogicalToDisplay(), TABLENAMELogicalToOdbc(), TABLENAMENormalize(), TABLENAMESet()
property TABLESCHEMA as %String (COLLATION = "Upper", MAXLEN = 128) [ SqlFieldName = TABLE_SCHEMA , Required ];
Name of schema that contains the table.
Property methods: TABLESCHEMADisplayToLogical(), TABLESCHEMAGet(), TABLESCHEMAIsValid(), TABLESCHEMALogicalToDisplay(), TABLESCHEMALogicalToOdbc(), TABLESCHEMANormalize(), TABLESCHEMASet()

Indexes

index (PKeyIndex on TABLESCHEMA,TABLENAME,CONSTRAINTNAME,COLUMNNAME) [PrimaryKey];
Index methods: PKeyIndexCheck(), PKeyIndexCheckUnique(), PKeyIndexDelete(), PKeyIndexExists(), PKeyIndexOpen(), PKeyIndexSQLCheckUnique(), PKeyIndexSQLExists(), PKeyIndexSQLFindPKeyByConstraint(), PKeyIndexSQLFindRowIDByConstraint()

Inherited Members

Inherited Methods

Storage

Gray indicates storage defined by superclasses.

Storage Model: SQLStorage

Maps: 2

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