如何将此select转换为DELETE语句需要帮助：

Question

我需要关于如何将此select转换为delete语句的帮助。

SELECT stud_term_sum_div.id_num, 
    stud_term_sum_div.hrs_enrolled, 
    stud_term_sum_div.transaction_sts, 
    student_crs_hist.crs_cde, 
    student_crs_hist.transaction_sts 
    FROM stud_term_sum_div, 
    student_crs_hist 
WHERE (stud_term_sum_div.yr_cde = student_crs_hist.yr_cde) and 
    (stud_term_sum_div.trm_cde = student_crs_hist.trm_cde) and 
    (stud_term_sum_div.id_num = student_crs_hist.id_num) and 
    ((stud_term_sum_div.yr_cde = '2013') AND 
    (stud_term_sum_div.trm_cde = 'FA') AND 
    (stud_term_sum_div.hrs_enrolled >= 3.00) AND 
    (student_crs_hist.transaction_sts = 'D')) 

Answer 1

最直接的转换低于：

DELETE * FROM stud_term_sum_div 
WHERE (stud_term_sum_div.yr_cde = student_crs_hist.yr_cde) and 
(stud_term_sum_div.trm_cde = student_crs_hist.trm_cde) and 
(stud_term_sum_div.id_num = student_crs_hist.id_num) and 
((stud_term_sum_div.yr_cde = '2013') AND 
(stud_term_sum_div.trm_cde = 'FA') AND 
(stud_term_sum_div.hrs_enrolled >= 3.00) AND 
(student_crs_hist.transaction_sts = 'D')) 

，但你走在执行之前，请检查WHERE条款确实包含用于删除的条件。请注意，当WHERE子句中的属性满足所述条件时，此SQL语句将删除整行（a/k/a记录）。

如果您只想从属性中删除数据（而不是整个记录），则需要改为使用SQL UPDATE语句。 （简化）语法是如下：

UPDATE <table_name> 
SET <attribute1> = <value1> 
[, SET <attribute_n> = <value_n>...] 
WHERE <conditions on which the record should be updated> 

做在Bing，谷歌，<搜索这里>插入您最喜欢的搜索引擎“DELETE语句”或“SQL UPDATE”应该让你的所有信息你需要（例如MSDN）。