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我有下面的过程，我想将字符串数据转换为日期并将其与其他日期进行比较。

这eev.screen_entry_value是一个 Varchar2，其值的格式为“2018/10/26 00:00:00”。

我想将其转换为日期格式并与其他日期进行比较，如下所示 -

TO_DATE(to_date(eev.screen_entry_value,'YYYY/MM/DD HH24:MI:SS'),'DD-MON-YYYY') BETWEEN P_START_DATE AND P_END_DATE;

但是，我遇到了一个错误-

ORA-01861: 文字与格式字符串不匹配

下面是我的代码片段-

declare
 p_start_date DATE;
 p_end_date DATE;
 p_screen_entry_value varchar2(60);
BEGIN
 SELECT ptp2.start_date, ptp2.end_date
 into p_start_date, p_end_date
 FROM  per_time_periods ptp
 , per_time_periods ptp2
 , pay_payrolls_f pp
 WHERE pp.payroll_name LIKE 'US Semi-Monthly'
 AND TRUNC(sysdate) BETWEEN pp.effective_start_date AND pp.effective_end_date
 AND pp.payroll_id = ptp.payroll_id
 AND TRUNC(sysdate) BETWEEN ptp.START_DATE AND ptp.END_DATE
 AND ptp.payroll_id = ptp2.payroll_id
 AND ptp.end_date BETWEEN ptp2.start_date AND ptp2.end_date;
 dbms_output.put_line(p_start_date);
 dbms_output.put_line(p_end_date);

 SELECT eev.screen_entry_value
 into p_screen_entry_value
 FROM  pay_input_values_f piv,
 pay_element_types_f et,
 pay_element_links_f el,
 pay_element_entries_f ee, 
 pay_element_entry_values_f eev
 WHERE  
  ee.assignment_id IN (364018)
  AND ee.element_link_id = el.element_link_id
  AND sysdate  BETWEEN el.effective_start_date 
            AND el.effective_end_date
  AND ee.element_type_id = et.element_type_id
  AND sysdate BETWEEN et.effective_start_date
            AND et.effective_end_date
  AND et.attribute_category = 'US Elements'
  AND et.attribute1 = 'Y' --Interface to ProBusiness
  AND ee.element_entry_id = eev.element_entry_id
  AND sysdate  BETWEEN eev.effective_start_date
            AND eev.effective_end_date
  AND eev.input_value_id = piv.input_value_id
  AND sysdate  BETWEEN piv.effective_start_date
            AND piv.effective_end_date
  AND eev.screen_entry_value IS NOT NULL  
  AND et.element_name IN ('HV Sign On Bonus','HV Retention  Bonus','Relocation')  --XX_HR_NONREC_ELEMENTS
  AND piv.name IN('Vested 1 Date');
 --AND TO_DATE(to_date(eev.screen_entry_value,'YYYY/MM/DD HH24:MI:SS'),'DD-MON-YYYY') BETWEEN P_START_DATE AND P_END_DATE;
 dbms_output.put_line(p_screen_entry_value);

 end;
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1 回答 1

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做to_date(to_date(...))真的没有意义。内部将字符串转换为日期，然后外部尝试将该日期转换为...日期。要尝试这样做，它必须再次将日期隐式转换回字符串，并且它将使用您的会话NLS_DATE_FORMAT进行该隐式步骤。

如果您想将其恢复为特定格式的字符串，您将to_char()用于外部调用：

to_char(to_date(eev.screen_entry_value,'YYYY/MM/DD HH24:MI:SS'),'DD-MON-YYYY') ...

但是您要比较的值是日期，因此您根本不需要或不需要第二次转换：

to_date(eev.screen_entry_value,'YYYY/MM/DD HH24:MI:SS')
BETWEEN P_START_DATE AND P_END_DATE
于 2018-10-30T21:51:24.127 回答