Show This function is used to expand an array to a set of rows. Syntax: Return Type: setof anyelement PostgreSQL Version: 9.3 Example: PostgreSQL UNNEST() function Code: SELECT unnest(ARRAY[1,2]);Sample Output: Previous: STRING_TO_ARRAY function
What is Ordinality in PostgreSQL?Use WITH ORDINALITY for set-returning functions: When a function in the FROM clause is suffixed by WITH ORDINALITY , a bigint column is appended to the output which starts from 1 and increments by 1 for each row of the function's output. This is most useful in the case of set returning functions such as unnest() .
What does Unnest function do?The UNNEST function returns a result table that includes a row for each element of the specified array. If there are multiple ordinary array arguments specified, the number of rows will match the array with the largest cardinality.
What is Unnest?: to put out of or as if out of a nest.
How does cross join Unnest work?A cross join will take every individual element of your unnested array and join it back to its parent row. This will create multiple rows for each element of your array but you can then filter it down.
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Select unnest postgres
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