oracle splitstr 函数

splitstr函数

CREATE OR REPLACE FUNCTION splitstr(p_string IN VARCHAR2, p_delimiter IN VARCHAR2)
    RETURN str_split  PIPELINED
AS
    v_length   NUMBER := LENGTH(p_string);
    v_start    NUMBER := 1;
    v_index    NUMBER;
BEGIN
    WHILE(v_start <= v_length)
    LOOP
        v_index := INSTR(p_string, p_delimiter, v_start);

        IF v_index = 0
        THEN
            PIPE ROW(SUBSTR(p_string, v_start));
            v_start := v_length + 1;
        ELSE
            PIPE ROW(SUBSTR(p_string, v_start, v_index - v_start));
            v_start := v_index + 1;
        END IF;
    END LOOP;

    RETURN;
END splitstr;

使用splitstr函数

    SELECT COLUMN_VALUE FROM TABLE(SPLITSTR('1,9', ',')) ;

假如表A的一列数据有A1,A2等分隔符分开 此时需要对表A的这个字段进行统计

--id中的值可能有1,2 1 2 等
SELECT 
  R.NAME ,
  SUM(DECODE(E.STATUS,1,1,0)) AS 状态为1的总数,
  SUM(DECODE(E.STATUS,2,1,0)) AS 状态为2的总数
  FROM A E, 字典表 R
 WHERE EXISTS (SELECT COLUMN_VALUE
          FROM TABLE(SPLITSTR(E.id, ',')) it
         WHERE it.column_value = r.id)
GROUP BY R.NAME;