我想结合以下两个问题,任何人都可以告诉我如何做到这一点?
(INSERT
查询只应在SELECT
查询有结果的情况下运行)
查询否1 :
INSERT IGNORE INTO senders(
sender_id,
telephone,
)
VALUES ( 1, 0723355888)
查询否2 :
SELECT student_name
FROM students
WHERE student_id =1
答案 0 :(得分:2)
INSERT INTO senders (sender_id, telephone)
SELECT student_id, student_telephone FROM students
WHERE student_id = 1
LIMIT 1
或者如果telefone不是学生表的一部分,则硬编码: 这是有效的,因为如果查询0行,则根本不执行任何插入。
INSERT INTO senders (sender_id, telephone)
SELECT 1, 0723355888 FROM students
WHERE student_id = 1
LIMIT 1
答案 1 :(得分:0)
尝试使用此查询 -
INSERT IGNORE INTO senders (sender_id, telephone)
SELECT student_id as sender_id, telephone
FROM students
WHERE student_id=1
答案 2 :(得分:0)
试试这个:
INSERT IGNORE INTO senders( sender_id, telephone)
SELECT 1 as sender_id, 0723355888 as telephone
FROM students WHERE student_id =1