oracle - PL SQL query to find a list of identifiers that matches all values in a list

Oracle - PL SQL query to find a list of identifiers that matches all values in a list

To find a list of identifiers that match all values in a list using PL/SQL in Oracle, you can use a combination of SQL queries and collections. Here's how you can do it:

Suppose you have a table named your_table with a column named identifier and you want to find the identifiers that match all values in a given list.

Here's a PL/SQL function that takes a list of values as input and returns a list of identifiers that match all values:

CREATE OR REPLACE FUNCTION find_matching_identifiers ( value_list IN SYS.ODCIVARCHAR2LIST ) RETURN SYS.ODCIVARCHAR2LIST IS matching_identifiers SYS.ODCIVARCHAR2LIST; BEGIN -- Initialize the result list matching_identifiers := SYS.ODCIVARCHAR2LIST(); -- Use a cursor to query the identifiers FOR r IN ( SELECT identifier FROM your_table GROUP BY identifier HAVING COUNT(DISTINCT CASE WHEN your_table.column_name IN (SELECT COLUMN_VALUE FROM TABLE(value_list)) THEN 1 END) = CARDINALITY(value_list) ) LOOP -- Add matching identifiers to the result list matching_identifiers.EXTEND; matching_identifiers(matching_identifiers.LAST) := r.identifier; END LOOP; -- Return the result list RETURN matching_identifiers; END; /

Here's how you can call the function and pass a list of values:

DECLARE values_list SYS.ODCIVARCHAR2LIST := SYS.ODCIVARCHAR2LIST('value1', 'value2', 'value3'); matching_identifiers SYS.ODCIVARCHAR2LIST; BEGIN matching_identifiers := find_matching_identifiers(values_list); FOR i IN 1..matching_identifiers.COUNT LOOP DBMS_OUTPUT.PUT_LINE('Matching Identifier: ' || matching_identifiers(i)); END LOOP; END; /

This PL/SQL function performs the following steps:

  1. Initializes an empty list for storing matching identifiers.
  2. Queries the your_table table using a cursor, grouping by the identifier column.
  3. Counts the number of distinct values from the input list that match the identifiers in the table.
  4. If the count matches the number of values in the input list, adds the identifier to the result list.
  5. Returns the list of matching identifiers.

You can call this function and pass a list of values to find the identifiers that match all values in the list. Adjust the table name, column name, and input values according to your specific use case.

Examples

  1. Using INTERSECT

    • Description: The INTERSECT operator in PL/SQL can be used to find identifiers that match all values in a provided list.
    • Code:
      SELECT identifier FROM your_table WHERE value_column IN ('value1', 'value2', 'value3') INTERSECT SELECT identifier FROM your_table WHERE value_column IN ('value1', 'value2', 'value3');

  2. Using GROUP BY and HAVING

    • Description: This query groups the data by identifier and then filters the groups to include only those that have all values from the list.
    • Code:
      SELECT identifier FROM your_table WHERE value_column IN ('value1', 'value2', 'value3') GROUP BY identifier HAVING COUNT(DISTINCT value_column) = 3;

  3. Using EXISTS Clause

    • Description: This query checks for the existence of rows with each value in the list for each identifier.
    • Code:
      SELECT identifier FROM your_table t1 WHERE EXISTS ( SELECT 1 FROM your_table t2 WHERE t2.identifier = t1.identifier AND t2.value_column = 'value1' ) AND EXISTS ( SELECT 1 FROM your_table t3 WHERE t3.identifier = t1.identifier AND t3.value_column = 'value2' ) AND EXISTS ( SELECT 1 FROM your_table t4 WHERE t4.identifier = t1.identifier AND t4.value_column = 'value3' );

  4. Using LISTAGG and REGEXP

    • Description: This query concatenates values for each identifier and then checks if the concatenated string matches a regular expression pattern.
    • Code:
      SELECT identifier FROM ( SELECT identifier, LISTAGG(value_column, ',') WITHIN GROUP (ORDER BY value_column) AS value_list FROM your_table GROUP BY identifier ) WHERE REGEXP_LIKE(value_list, 'value1,value2,value3');

  5. Using COUNT and CASE Statements

    • Description: This query counts the occurrences of each value for each identifier and checks if the count equals the total number of values in the list.
    • Code:
      SELECT identifier FROM ( SELECT identifier, COUNT(CASE WHEN value_column = 'value1' THEN 1 END) + COUNT(CASE WHEN value_column = 'value2' THEN 1 END) + COUNT(CASE WHEN value_column = 'value3' THEN 1 END) AS total_count FROM your_table GROUP BY identifier ) WHERE total_count = 3;

  6. Using PIVOT Clause

    • Description: This query uses the PIVOT clause to transform rows into columns, making it easier to count occurrences of each value for each identifier.
    • Code:
      SELECT identifier FROM ( SELECT identifier, value_column FROM your_table WHERE value_column IN ('value1', 'value2', 'value3') ) PIVOT ( COUNT(value_column) FOR value_column IN ('value1' AS val1, 'value2' AS val2, 'value3' AS val3) ) WHERE val1 > 0 AND val2 > 0 AND val3 > 0;

  7. Using XMLQuery

    • Description: This query utilizes XMLQuery to check if the values exist for each identifier.
    • Code:
      SELECT identifier FROM your_table WHERE XMLExists( '/row[value_column="value1" or value_column="value2" or value_column="value3"]' PASSING XMLType('<row>' || XMLSerialize(CONTENT value_column) || '</row>') ) GROUP BY identifier HAVING COUNT(DISTINCT value_column) = 3;

  8. Using ARRAY_AGG and SUBSTR

    • Description: This query aggregates values for each identifier into an array and then checks if the array matches a specific pattern.
    • Code:
      SELECT identifier FROM ( SELECT identifier, ARRAY_AGG(value_column ORDER BY value_column) AS value_list FROM your_table GROUP BY identifier ) WHERE SUBSTR(value_list, 2, LENGTH(value_list) - 2) = 'value1,value2,value3';

  9. Using BITAND Function

    • Description: This query uses the BITAND function to check if the bitwise AND operation of values for each identifier matches a specific pattern.
    • Code:
      SELECT identifier FROM ( SELECT identifier, BITAND(value_column_bitmask, 7) AS result FROM ( SELECT identifier, BITOR(1 << (value_column - 1), 0) AS value_column_bitmask FROM your_table WHERE value_column IN (1, 2, 3) ) GROUP BY identifier, value_column_bitmask ) WHERE result = 7;

  10. Using JSON_ARRAYAGG and JSON_CONTAINS

    • Description: This query aggregates values for each identifier into a JSON array and then checks if the array contains all values from the list.
    • Code:
      SELECT identifier FROM ( SELECT identifier, JSON_ARRAYAGG(value_column) AS value_list FROM your_table GROUP BY identifier ) WHERE JSON_CONTAINS(value_list, '["value1", "value2", "value3"]');

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