From b3174f6b854db5b44d3b0ebaf19a84dc81339c62 Mon Sep 17 00:00:00 2001
From: Luthics <luthics@foxmail.com>
Date: Fri, 9 Dec 2022 12:35:34 +0800
Subject: [PATCH] =?UTF-8?q?=E6=9B=B4=E6=96=B0=E6=95=B0=E6=8D=AE=E5=BA=93?=
 =?UTF-8?q?=E7=B3=BB=E5=88=97=E4=BD=9C=E4=B8=9A?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 test/7/1.sql |  1 +
 test/7/2.sql | 25 +++++++++++++++
 test/7/3.sql |  9 ++++++
 test/7/4.sql | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 test/7/5.sql | 31 +++++++++++++++++++
 5 files changed, 152 insertions(+)
 create mode 100644 test/7/1.sql
 create mode 100644 test/7/2.sql
 create mode 100644 test/7/3.sql
 create mode 100644 test/7/4.sql
 create mode 100644 test/7/5.sql

diff --git a/test/7/1.sql b/test/7/1.sql
new file mode 100644
index 0000000..c6e84e0
--- /dev/null
+++ b/test/7/1.sql
@@ -0,0 +1 @@
+sqlite3 library.db 'create table test(id integer primary key, value text);'
\ No newline at end of file
diff --git a/test/7/2.sql b/test/7/2.sql
new file mode 100644
index 0000000..a1a6867
--- /dev/null
+++ b/test/7/2.sql
@@ -0,0 +1,25 @@
+create table reader (
+    number varchar(10) primary key,
+    name varchar(20),
+    gender varchar(8),
+    age integer,
+    major varchar(20)
+);
+
+INSERT INTO
+    reader
+VALUES
+    ("20090005", "john", "male", 22, "math"),
+    ("20090007", "sunnny", "male", 25, "medicine"),
+    ("20090008", "lee", "male", 21, "medicine"),
+    ("20090009", "nancy", "male", 26, "math"),
+    ("20090010", "Billy", "female", 24, "science"),
+    ("20090011", "tina", "female", 23, "physics"),
+    ("20090012", "bunny", "female", 23, "physics"),
+    ("20090013", "daisy", "female", 21, "science"),
+    ("20090014", "henry", "male", 12, "science");
+
+select
+    *
+from
+    reader;
\ No newline at end of file
diff --git a/test/7/3.sql b/test/7/3.sql
new file mode 100644
index 0000000..9f91c43
--- /dev/null
+++ b/test/7/3.sql
@@ -0,0 +1,9 @@
+delete from
+    reader
+where
+    number = 20090013;
+
+select
+    *
+from
+    reader;
\ No newline at end of file
diff --git a/test/7/4.sql b/test/7/4.sql
new file mode 100644
index 0000000..7ff7302
--- /dev/null
+++ b/test/7/4.sql
@@ -0,0 +1,86 @@
+-- 请根据下方提示，在正确位置填写代码或脚本。
+/********** Begin *********/
+--1.查询reader表所有信息；
+select
+    *
+from
+    reader;
+
+--2.查询专业为‘medicine’的专业的学生的姓名和年龄；
+select
+    name,
+    age
+from
+    reader
+where
+    major = "medicine";
+
+--3.查询读者来自哪些专业，显示不同的专业。
+select
+    DISTINCT major
+from
+    reader;
+
+--4.查询年龄在25岁以上的读者的学号和姓名，显示学号和姓名。
+select
+    number,
+    name
+from
+    reader
+where
+    age > 25;
+
+--5.查询年龄在不超过24岁的学生的学号、姓名和年龄，结果按年龄降序排列。
+select
+    number,
+    name,
+    age
+from
+    reader
+where
+    age <= 24
+order by
+    age DESC;
+
+--6.查询“信计”专业所有学生的学号、姓名，结果按年龄大小排列。（不显示年龄）。
+select
+    number,
+    name
+from
+    reader
+where
+    major = "science"
+order by
+    age;
+
+--7.统计学生人数。
+select
+    count(*)
+from
+    reader;
+
+--8.统计所有学生的平均年龄。
+select
+    avg(age)
+from
+    reader;
+
+--9.查询所有学生的最大年龄。
+select
+    max(age)
+from
+    reader;
+
+--10.查询所有学生的最小年龄。
+select
+    min(age)
+from
+    reader;
+
+--11.查询所有学生的最大年龄差。
+select
+    max(age) - min(age)
+from
+    reader;
+
+/********** End *********/
\ No newline at end of file
diff --git a/test/7/5.sql b/test/7/5.sql
new file mode 100644
index 0000000..1464281
--- /dev/null
+++ b/test/7/5.sql
@@ -0,0 +1,31 @@
+-- 请根据下方提示，在正确位置填写代码或脚本。
+.header on.mode column
+/********** Begin *********/
+-- 将tina同学的专业更新为“math”
+update
+    reader
+set
+    major = "math"
+where
+    name = "tina";
+
+/********** End *********/
+select
+    *
+from
+    reader;
+
+/********** Begin *********/
+--查询专业为“science”的学生信息，将science专业的学生的年龄统一增加1岁。
+update
+    reader
+set
+    age = age + 1
+where
+    major = "science";
+
+/********** End *********/
+select
+    *
+from
+    reader;
\ No newline at end of file