Add POSITION_IN_UNIQUE_CONSTRAINT from SQL:2003

h2/src/main/org/h2/table/MetaTable.java

@@ -568,7 +568,8 @@ public class MetaTable extends Table {
                     "TABLE_SCHEMA",
                     "TABLE_NAME",
                     "COLUMN_NAME",
-                    "ORDINAL_POSITION"
+                    "ORDINAL_POSITION",
+                    "POSITION_IN_UNIQUE_CONSTRAINT"
             );
             indexColumnName = "TABLE_NAME";
             break;
@@ -1948,6 +1949,7 @@ public class MetaTable extends Table {
                 }
                 for (int i = 0; i < indexColumns.length; i++) {
                     IndexColumn indexColumn = indexColumns[i];
+                    String ordinalPosition = Integer.toString(i + 1);
                     add(rows,
                             // CONSTRAINT_CATALOG
                             catalog,
@@ -1964,7 +1966,9 @@ public class MetaTable extends Table {
                             // COLUMN_NAME
                             indexColumn.columnName,
                             // ORDINAL_POSITION
-                            Integer.toString(i + 1)
+                            ordinalPosition,
+                            // POSITION_IN_UNIQUE_CONSTRAINT
+                            (constraintType == Constraint.Type.REFERENTIAL ? ordinalPosition : null)
                         );
                 }
             }

h2/src/test/org/h2/test/scripts/information_schema.sql

@@ -19,21 +19,21 @@ ALTER TABLE T2 ADD CONSTRAINT FK_1 FOREIGN KEY (C3, C4) REFERENCES T1(C1, C3);
 > ok
 
 SELECT * FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE LIMIT 0;
-> CONSTRAINT_CATALOG CONSTRAINT_SCHEMA CONSTRAINT_NAME TABLE_CATALOG TABLE_SCHEMA TABLE_NAME COLUMN_NAME ORDINAL_POSITION
-> ------------------ ----------------- --------------- ------------- ------------ ---------- ----------- ----------------
+> CONSTRAINT_CATALOG CONSTRAINT_SCHEMA CONSTRAINT_NAME TABLE_CATALOG TABLE_SCHEMA TABLE_NAME COLUMN_NAME ORDINAL_POSITION POSITION_IN_UNIQUE_CONSTRAINT
+> ------------------ ----------------- --------------- ------------- ------------ ---------- ----------- ---------------- -----------------------------
 > rows: 0
 
-SELECT CONSTRAINT_NAME, TABLE_NAME, COLUMN_NAME, ORDINAL_POSITION FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE
+SELECT CONSTRAINT_NAME, TABLE_NAME, COLUMN_NAME, ORDINAL_POSITION, POSITION_IN_UNIQUE_CONSTRAINT FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE
     WHERE CONSTRAINT_CATALOG = DATABASE() AND CONSTRAINT_SCHEMA = SCHEMA() AND TABLE_CATALOG = DATABASE() AND TABLE_SCHEMA = SCHEMA()
     ORDER BY TABLE_NAME, CONSTRAINT_NAME, ORDINAL_POSITION;
-> CONSTRAINT_NAME TABLE_NAME COLUMN_NAME ORDINAL_POSITION
-> --------------- ---------- ----------- ----------------
-> PK_1            T1         C1          1
-> PK_1            T1         C2          2
-> U_1             T1         C3          1
-> U_1             T1         C4          2
-> FK_1            T2         C3          1
-> FK_1            T2         C4          2
+> CONSTRAINT_NAME TABLE_NAME COLUMN_NAME ORDINAL_POSITION POSITION_IN_UNIQUE_CONSTRAINT
+> --------------- ---------- ----------- ---------------- -----------------------------
+> PK_1            T1         C1          1                null
+> PK_1            T1         C2          2                null
+> U_1             T1         C3          1                null
+> U_1             T1         C4          2                null
+> FK_1            T2         C3          1                1
+> FK_1            T2         C4          2                2
 > rows (ordered): 6
 
 DROP TABLE T2;