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 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 removes the last populated element from the shots array.
SELECT id, shots.OTRIM() FROM seismic_table WHERE id = 1;
The following is the result of the query.
ID shots.OTRIM() -- ------------- 1 (11)
The following query removes the last two populated elements from the shots array.
SELECT id, shots.OTRIM(2) FROM seismic_table;
The following is the result of the query.
ID shots.OTRIM(2) -- -------------- 1 () (the only 2 populated elements were removed so we now have an empty array value) 2 (NULL)
The following is the same query using function-style syntax.
SELECT id, OTRIM(shots, 2) FROM seismic_table;