Example: Query 2-D ARRAY Data Type and Table Using OEXISTS - Teradata Vantage

Consider the following 2-D ARRAY data type and table.

CREATE TYPE shot_ary AS VARRAY(1:50)(1:50) OF INTEGER;
CREATE TABLE seismic_table (
   id INTEGER,
   shots shot_ary);

The table is populated with the following values:

/* The first 2 elements are populated; the rest are uninitialized. */
INSERT INTO seismic_table VALUES (1, shot_ary(11, 12));
/* Empty ARRAY instance */
INSERT INTO seismic_table VALUES (2, shot_ary());
/* Update the empty ARRAY instance such that element [1][3] is set to a value; then elements [1][1] and [1][2] are set to NULL, the rest are uninitialized */
UPDATE seismic_table
SET shots[1][3] = 1133
WHERE id = 2;

The following query checks to see whether element [1][2] of the shots array contains a value.

SELECT id, shots.OEXISTS(NEW arrayVec(1, 2))
FROM seismic_table;

The following is the result of the query.

ID          shots.OEXISTS(new arrayVec(1, 2))
--          ---------------------------------
 1           1           (element [1][2] contains a value that is non-NULL)
 2           1           (element [1][2] contains a NULL)

The following query checks to see whether element [1][3] of the shots array contains a value.

SELECT id, shots.OEXISTS(NEW arrayVec(1, 3)) 
FROM seismic_table;

The following is the result of the query.

ID          shots.OEXISTS(NEW arrayVec(1, 3))
--          ---------------------------------
 1           0           (element [1][3] is in an uninitialized state)
 2           1           (element [1][3] contains a value that is non-NULL)