How to Find the Number Of Rows Present In A Json Array In Oracle?

To find the number of rows present in a JSON array in Oracle, you can use the JSON_table function along with the count function. First, you need to convert the JSON array into rows using the JSON_table function and then use the count function to count the number of rows. This will give you the total number of rows present in the JSON array.

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How to find the size of a JSON array in Oracle SQL?

You can find the size of a JSON array in Oracle SQL by using the JSON_TABLE function. Here's an example query that demonstrates how to do this:

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SELECT count(*)
FROM your_table,
JSON_TABLE(json_column, '$[*]' COLUMNS (
    json_val PATH '$'
)) j

In this query, replace your_table with the name of your table and json_column with the column that contains the JSON array. The JSON_TABLE function is used to parse the JSON array and create a virtual table with each element in the array as a separate row. The count(*) function is then used to count the number of rows in the virtual table, which corresponds to the size of the JSON array.

What is the procedure to count the rows in a JSON array in Oracle?

To count the rows in a JSON array in Oracle, you can use the JSON_TABLE function along with the COUNT function. Here is a step-by-step procedure:

1. Create a sample JSON array in a file or directly in a variable in Oracle. For example:

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{
  "employees": [
    {"name": "John Doe", "department": "Sales"},
    {"name": "Jane Smith", "department": "Marketing"},
    {"name": "Bob Johnson", "department": "HR"}
  ]
}

1. Use the JSON_TABLE function to convert the JSON array into rows. In the example below, we are storing the JSON array in a CLOB column named json_data in a table named json_table:

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CREATE TABLE json_table (
  id NUMBER PRIMARY KEY,
  json_data CLOB
);

INSERT INTO json_table VALUES (1, '{
  "employees": [
    {"name": "John Doe", "department": "Sales"},
    {"name": "Jane Smith", "department": "Marketing"},
    {"name": "Bob Johnson", "department": "HR"}
  ]
}');

1. Use the JSON_TABLE function to extract the elements from the JSON array and count the rows. In this example, we are counting the number of employees in the JSON array:

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SELECT COUNT(*) AS num_rows
FROM json_table,
JSON_TABLE(json_table.json_data, '$.employees[*]'
    COLUMNS (
      name VARCHAR2 PATH '$.name',
      department VARCHAR2 PATH '$.department'
    )
  );

This will return the number of rows in the JSON array, which in this case is 3.

1. You can also add a WHERE condition to filter the rows based on specific criteria before counting.

How to determine the length of a JSON array in Oracle?

In Oracle, you can determine the length of a JSON array by using the JSON_ARRAYAGG and JSON_TABLE functions in combination with the COUNT function. Here's an example:

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SELECT COUNT(*) AS array_length
FROM JSON_TABLE(
    '["apple", "banana", "cherry", "date"]',
    '$[*]'
    COLUMNS (
        column_value VARCHAR2 PATH '$'
    )
);

In this example, the JSON_TABLE function is used to convert the JSON array into a virtual table, with each element in the array represented as a row. The COUNT function is then used to count the number of rows in the virtual table, which corresponds to the length of the JSON array.

You can replace the JSON string ['"apple", "banana", "cherry", "date'] with your own JSON array to determine its length.

What is the query to count the number of rows in a JSON array in Oracle?

In Oracle, you can count the number of rows in a JSON array using the following query:

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SELECT COUNT(*) FROM JSON_TABLE('{"items": ["item1", "item2", "item3"]}' 
COLUMNS (nested PATH '$.items[*]' COLUMNS (j VARCHAR2(100) PATH '$' )
)

This query will return the count of rows in the JSON array, which in this case would be 3.

What is the code to count the rows in a JSON array in Oracle?

You can count the rows in a JSON array in Oracle by using the JSON_TABLE function with the NESTED option and the COUNT(*) function. Here is an example code snippet:

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SELECT COUNT(*) AS total_rows
FROM your_table,
JSON_TABLE(your_json_column, '$[*]' COLUMNS (
  row_num FOR ORDINALITY
));

Replace your_table with the name of your table and your_json_column with the name of the column that contains the JSON array. This query will count the number of rows in the JSON array.