我無法更新表格。我應該怎麼寫更新表

Question

update kothari_kem.companyinfo ci 
set ci.viewsource = "" 
where ci.recid in (
    SELECT c.recid 
    FROM kothari_kem.companyinfo c 
    where (c.contactperson = NULL or c.contactperson = "") 
    AND (c.viewsource = NULL or c.viewsource = "Y") 
) 

Answer 1

試試這個：

CREATE TEMPORARY TABLE tt (id INT); 
INSERT INTO tt 
    SELECT c.recid 
    FROM kothari_kem.companyinfo c 
    where (c.contactperson IS NULL or c.contactperson = "") 
    AND (c.viewsource IS NULL or c.viewsource = "Y"); 
UPDATE kothari_kem.companyinfo ci 
SET ci.viewsource = "" 
WHERE ci.recid in 
    (SELECT id FROM tt) 

無論如何，我認爲你的查詢可以改寫爲

UPDATE kothari_kem.companyinfo ci 
SET ci.viewsource = "" 
WHERE (ci.contactperson IS NULL or ci.contactperson = "") 
    AND (ci.viewsource IS NULL or ci.viewsource = "Y")