How to use arrays as query conditions for in sql

Methods in SQL to use arrays as IN query conditions: 1. Create array variables: Use the CREATE ARRAY statement to create array variables, including the required values. 2. Use array variables in IN query: In IN query, use array variables as a list of values ​​to check whether column values ​​are included in the array.

How to use an array as a condition for an IN query in SQL

In SQL, the IN operator is used to check whether a value is included in a list of values. Typically, this list is provided in the form of a comma-separated list of values. However, you can also use arrays as IN lists.

step:

1. Create an array variable: Use the CREATE ARRAY statement to create an array variable to store your values. The syntax is as follows:

 <code class="sql">CREATE ARRAY array_name AS ARRAY[<type>] OF <value1>, <value2>, ...;</value2></value1></type></code>

For example, to create an integer array named my_array with values ​​1, 2, and 3, use the following statement:

 <code class="sql">CREATE ARRAY my_array AS ARRAY[INTEGER] OF 1, 2, 3;</code>

2. Use array variables in IN queries: Use array_name variable as a list of values ​​in IN queries. The syntax is as follows:

 <code class="sql">SELECT * FROM table_name WHERE column_name IN (array_name);</code>

For example, to select a column_name column value that contains the value in my_array , use the following query:

 <code class="sql">SELECT * FROM table_name WHERE column_name IN (my_array);</code>

Notes:

• Make sure the array variable has the same data type as the column you are querying.
• The array variables in the IN query must be a single-dimensional array.
• If the array variable is empty, the IN query will return an empty result.

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