From 76c2737ce7aba26625567ddc75cae25c09503500 Mon Sep 17 00:00:00 2001
From: expressgy <x71291@outlook.com>
Date: Sun, 31 Mar 2024 19:29:10 +0800
Subject: [PATCH] =?UTF-8?q?=E5=AD=A6=E4=B9=A0mysql=20=E5=91=8A=E4=B8=80?=
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---
 ...ql是怎样使用的数据初始化7.0.sql | 42 +++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/docs/MySQL/mysql是怎样使用的数据初始化7.0.sql b/docs/MySQL/mysql是怎样使用的数据初始化7.0.sql
index eab885b..13dac52 100644
--- a/docs/MySQL/mysql是怎样使用的数据初始化7.0.sql
+++ b/docs/MySQL/mysql是怎样使用的数据初始化7.0.sql
@@ -248,3 +248,45 @@ CREATE table first_table(
     second_column VARCHAR(100)
 );
 
+-- 插入数据
+-- 不写列明 默认按照建表的顺序 （每列必须明确写出值，可以用NULL替代）
+INSERT INTO first_table VALUE (1, '哈哈');
+-- 指定列名
+INSERT INTO first_table(first_column, second_column) VALUE (2, '嘿嘿');
+-- 可以调换列顺序
+INSERT INTO first_table(second_column, first_column) VALUE ('嘿嘿嘿', 3);
+
+
+-- 批量插入数据 VALUE => VALUES （VALUES也可以只插入一条数据）
+INSERT INTO
+    first_table(second_column, first_column)
+VALUE
+    ('嘿哈', 5),
+    ('嗯哼', 6),
+    ('唉嘿', 7),
+    ('嘻嘻', 8),
+    ('呜呜呜', 9);
+
+-- 插入其他表的数据
+
+INSERT INTO first_table SELECT * FROM first_table LIMIT 4;
+INSERT INTO first_table(first_column, second_column)  SELECT first_column, second_column FROM first_table WHERE first_column = 3;
+
+-- 删除记录
+DELETE FROM first_table;
+
+-- 创建存储函数
+-- 设置分隔符
+SET global log_bin_trust_function_creators = TRUE;
+DELIMITER $
+CREATE FUNCTION get_score_avg(subject_name VARCHAR(10))
+RETURNS DOUBLE
+BEGIN
+    RETURN (SELECT AVG(student_score.score) FROM student_score WHERE subject = subject_name);
+END $
+DELIMITER ;
+
+
+SHOW FUNCTION STATUS ;
+
+