PostgreSQL/Array/array dims

Using array_dims()

postgres=# CREATE TABLE book (id integer,titles text[]);
CREATE TABLE
postgres=#
postgres=# INSERT INTO book VALUES (102, "{"AAA\"s VVVV"}");
INSERT 0 1
postgres=# INSERT INTO book VALUES (103, "{"AAA", "VVVV"}");
INSERT 0 1
postgres=#
postgres=# -- Using array_dims(?)
postgres=# SELECT array_dims(titles) FROM book;
 array_dims
------------
 [1:1]
 [1:2]
(2 rows)
postgres=# drop table book;
DROP TABLE
postgres=#