Reference array element : Array Column Select « Array « PostgreSQL

1. PostgreSQL
2. Array
3. Array Column Select

Reference array element

postgres=#
postgres=#
postgres=# CREATE TABLE sal_emp (
postgres(#    name            text,
postgres(#    pay_by_quarter  integer[],
postgres(#    schedule        text[][]
postgres(# );
CREATE TABLE
postgres=#
postgres=# INSERT INTO sal_emp
postgres-#    VALUES ('Bill',
postgres(#    ARRAY[10000, 10000, 10000, 10000],
postgres(#    ARRAY[['meeting', 'lunch'], ['training', 'presentation']]);
INSERT 0 1
postgres=#
postgres=# INSERT INTO sal_emp
postgres-#    VALUES ('Carol',
postgres(#    ARRAY[20000, 25000, 25000, 25000],
postgres(#    ARRAY[['breakfast', 'consulting'], ['meeting', 'lunch']]);
INSERT 0 1
postgres=#
postgres=# -- Retrieves the third quarter pay of all employees:
postgres=#
postgres=# SELECT pay_by_quarter[3] FROM sal_emp;
 pay_by_quarter
----------------
          10000
          25000
(2 rows)

postgres=#
postgres=# SELECT * FROM sal_emp;
 name  |      pay_by_quarter       |                 schedule
-------+---------------------------+-------------------------------------------
 Bill  | {10000,10000,10000,10000} | {{meeting,lunch},{training,presentation}}
 Carol | {20000,25000,25000,25000} | {{breakfast,consulting},{meeting,lunch}}
(2 rows)

postgres=#
postgres=# drop table sal_emp;
DROP TABLE
postgres=#
postgres=#
           
       

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