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使用CONCAT函數時,Oracle SQL和PL/SQL的規則有何不同?如何在Oracle中爲CONCAT函數使用子查詢和函數。在Oralcle函數中使用CONCAT函數的子選擇
如果我有像下面一個簡單的查詢,它的工作原理
SELECT CONCAT (' A, B.',
(SELECT REGEXP_SUBSTR ('CC, DDD, E, ',
'[^,]+',
1,
1)
--INTO RESULT_PATTERN
FROM DUAL))
FROM DUAL;
但是,如果我加入這個在PL/SQL函數,我得到錯誤
FUNCTION TEST_SELECTION (BIT_PATTERN IN VARCHAR2,
SEL_PATTERN IN VARCHAR2)
RETURN VARCHAR2
IS
RESULT_PATTERN VARCHAR2 (250);
LOOP_BIT_PATTERN VARCHAR2 (10);
LOOP_SEL_PATERN VARCHAR2 (300);
TEMP_VAR VARCHAR2 (200);
BEGIN
IF (LENGTH (BIT_PATTERN) > 0 AND SUBSTR (BIT_PATTERN, 0, 1) = '1')
THEN
RESULT_PATTERN :=
CONCAT (RESULT_PATTERN,
(SELECT REGEXP_SUBSTR (SEL_PATTERN, **--This is line 35**
'[^,]+',
1,
1)
--TEMP_VAR
FROM DUAL)); **--This is line 40**
BIT_PATTERN := SUBSTR (BIT_PATTERN, 1);
SEL_PATTERN := '';
--TEST_SELECTION (BIT_PATTERN, SEL_PATTERN);
END IF;
END TEST_SELECTION;
的錯誤是
[Error] PLS-00103 (35: 22): PLS-00103: Encountered the symbol "SELECT" when expecting one of the following:
(- + case mod new not null <an identifier>
<a double-quoted delimited-identifier> <a bind variable>
continue
[Error] PLS-00103 (40: 33): PLS-00103: Encountered the symbol ")" when expecting one of the following:
. , @ ; for <an identifier>
<a double-quoted delimited-identifier> group having intersect
minus order partition sta
'return'需要在'end if'後面,以避免'ORA-06503:PL/SQL:函數返回無值'錯誤。 –
Upps,你是對的@William Robertson –
這只是一個示例。我真的試圖找出在PL/SQL中使用這種方法的CONCAT函數是否無效,即使它在SQL語句中有效。 – adbdkb