SQL ARRAY: Difference between revisions

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INSERT INTO some_table (some_column, ...) VALUES (ARRAY['string1', 'string2', ...], ...)
INSERT INTO some_table (some_column, ...) VALUES (ARRAY['string1', 'string2', ...], ...)
</syntaxhighlight>
</syntaxhighlight>
=Searching in Arrays=
==Searching for One Element==
<syntaxhighlight lang='sql'>
SELECT some_column FROM some_table WHERE 'value_we_search_for' = ANY(some_table.some_column)
</syntaxhighlight>
<code>some_column</code> must be a text <code>ARRAY</code> type. The expression above evaluates to TRUE if 'value_we_search_for' is in any of the array elements.
⚠️ The inclusion test '''must''' start with the value, it cannot start with <code>ANY()</code>. The following expression will produce a syntax error:
<syntaxhighlight lang='sql'>
... WHERE ANY(some_table.some_column) = 'value_we_search_for'
</syntaxhighlight>
=Implementation-Specific Details=
::{| class="wikitable" style="text-align: left;"
|-
| [[PostgreSQL_Concepts#Arrays|PostgreSQL]] || MySQL
|-
|}

Latest revision as of 19:28, 31 May 2024

Internal

Overview

Declaration

SQL declaration for unidimensional arrays:

CREATE TABLE some_table (
  some_column text ARRAY
  ...
)

ARRAY can be declared for any data types.

Insert

INSERT INTO some_table (some_column, ...) VALUES (ARRAY['string1', 'string2', ...], ...)

Searching in Arrays

Searching for One Element

SELECT some_column FROM some_table WHERE 'value_we_search_for' = ANY(some_table.some_column)

some_column must be a text ARRAY type. The expression above evaluates to TRUE if 'value_we_search_for' is in any of the array elements.

⚠️ The inclusion test must start with the value, it cannot start with ANY(). The following expression will produce a syntax error:

... WHERE ANY(some_table.some_column) = 'value_we_search_for'

Implementation-Specific Details

PostgreSQL MySQL