mysql insert的幾種狀況

時間 2020-12-14

標籤 mysql sql 測試 spa 3d code blog class test date 欄目 MySQL 简体版

原文原文鏈接

一普通單條插入：

像以下表中插入數據：mysql

id是自動增加的主鍵。sql

INSERT INTO student_score (student_name, score, SUBJECT) VALUES ('張三', 90, '語文');

　結果以下：測試

mysql> SELECT * FROM student_score;
+----+--------------+-------+---------+
| id | student_name | score | subject |
+----+--------------+-------+---------+
|  1 | 張三         |    90 | 語文    |
+----+--------------+-------+---------+
1 row in set

二批量插入：

INSERT INTO student_score (student_name, score, SUBJECT)
VALUES
    ('李四', 95, '語文'),
    ('王五', 98, '語文');

結果以下：spa

mysql> SELECT * FROM student_score;
+----+--------------+-------+---------+
| id | student_name | score | subject |
+----+--------------+-------+---------+
|  1 | 張三         |    90 | 語文    |
|  2 | 李四         |    95 | 語文    |
|  3 | 王五         |    98 | 語文    |
+----+--------------+-------+---------+
3 rows in set

三將數據從一個表插入另外一個表

首先清空student_score表，student_score_record的數據以下：3d

mysql> SELECT * FROM student_score_record;
+----+--------------+-------+---------+------------+
| id | student_name | score | subject | test_date  |
+----+--------------+-------+---------+------------+
|  1 | 張三         |     1 | 語文    | 2020-12-10 |
|  2 | 李四         |     2 | 語文    | 2020-12-11 |
|  3 | 王五         |     3 | 語文    | 2020-12-11 |
+----+--------------+-------+---------+------------+
3 rows in set

現須要將student_score_record的相關數據插入到student_score中：code

INSERT INTO student_score (student_name, score, SUBJECT) SELECT
    student_name,
    score,
    SUBJECT
FROM
    student_score_record;

結果以下：blog

mysql> SELECT * FROM student_score;
+----+--------------+-------+---------+
| id | student_name | score | subject |
+----+--------------+-------+---------+
|  7 | 張三         |     1 | 語文    |
|  8 | 李四         |     2 | 語文    |
|  9 | 王五         |     3 | 語文    |
+----+--------------+-------+---------+
3 rows in set

四將數據從多個關聯表插入一個表

首先清空student_score表，student表的數據以下：class

mysql> SELECT * FROM `student`;
+----+--------------+------------+
| id | student_name | student_id |
+----+--------------+------------+
|  1 | 張三         |          1 |
|  2 | 李四         |          2 |
|  3 | 王五         |          3 |
+----+--------------+------------+
3 rows in set

student_id_score_record表的數據以下：test

mysql> SELECT * FROM `student_id_score_record`;
+----+------------+-------+---------+
| id | student_id | score | subject |
+----+------------+-------+---------+
| 10 |          1 |    11 | 語文    |
| 11 |          2 |    12 | 語文    |
| 12 |          3 |    13 | 語文    |
+----+------------+-------+---------+
3 rows in set

如今將student和student_id_score_record的關聯信息插入到student_score表中：date

INSERT INTO student_score (student_name, score, SUBJECT) SELECT
    student.student_name,
    student_id_score_record.score,
    student_id_score_record.`subject`
FROM
    student
INNER JOIN student_id_score_record ON student.id = student_id_score_record.student_id;

結果以下：

mysql> SELECT * FROM student_score;
+----+--------------+-------+---------+
| id | student_name | score | subject |
+----+--------------+-------+---------+
| 10 | 張三         |    11 | 語文    |
| 11 | 李四         |    12 | 語文    |
| 12 | 王五         |    13 | 語文    |
+----+--------------+-------+---------+
3 rows in set

五將數據從其餘表插入一個表

仍是四中的例子，不過此次換種寫法（此寫法主要目的是測試將幾個獨立表的不一樣字段插入同一個表時如何處理）：

INSERT INTO student_score (student_name, score, SUBJECT)
VALUES
    (
        (
            SELECT
                student_name
            FROM
                student
            WHERE
                student_id = 1
        ),
        (
            SELECT
                score
            FROM
                student_id_score_record
            WHERE
                student_id = 1
        ),
        '語文'
    );

結果以下：

mysql> SELECT * FROM student_score;
+----+--------------+-------+---------+
| id | student_name | score | subject |
+----+--------------+-------+---------+
| 14 | 張三         |    11 | 語文    |
+----+--------------+-------+---------+
1 row in set