如何將此select轉換爲DELETE語句需要幫助：

Question

我需要關於如何將此select轉換爲delete語句的幫助。

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

最直接的轉換低於：

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')) 

，但你走在執行之前，請檢查WHERE條款確實包含用於刪除的條件。請注意，當WHERE子句中的屬性滿足所述條件時，此SQL語句將刪除整行（a/k/a記錄）。

如果您只想從屬性中刪除數據（而不是整個記錄），則需要改爲使用SQL UPDATE語句。 （簡化）語法是如下：

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，<搜索這裏>插入您最喜歡的搜索引擎「DELETE語句」或「SQL UPDATE」應該讓你的所有信息你需要（例如MSDN）。