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README.md

@@ -1,6 +1,6 @@
 # 枕上诗书闲的博客 :link: https://hantianzhun.github.io/blog 
 ### :page_facing_up: [8](https://hantianzhun.github.io/blog/tag.html) 
 ### :speech_balloon: 0 
-### :hibiscus: 37437 
-### :alarm_clock: 2024-11-18 07:08:26 
+### :hibiscus: 37473 
+### :alarm_clock: 2024-11-18 07:11:11 
 ### Powered by :heart: [Gmeek](https://github.com/Meekdai/Gmeek)

backup/SQL语句的练习.md

@@ -307,6 +307,7 @@ INSERT INTO emp VALUES(1002,'王五','文员',NULL,'2007-10-10',7000.00,NULL,40)
 INSERT INTO emp VALUES(1003,'赵六','开发',NULL,'2020-01-01',10000.00,NULL,30);
 
 #从表 员工表2
+#ON DELETE CASCADE ON UPDATE CASCADE 代表在主表有删除和更新时，从表会对应的删除记录和更新记录
 CREATE TABLE emp2(
 empno INT PRIMARY KEY,
 empname VARCHAR(20) NOT NULL,
@@ -317,7 +318,6 @@ sal DECIMAL(9,2),
 COMM DECIMAL(9,2),
 deptno INT,
 FOREIGN KEY(deptno) REFERENCES dept(deptno) ON DELETE CASCADE ON UPDATE CASCADE
-#代表在主表有删除和更新时，从表会对应的删除记录和更新记录
 )CHARSET=utf8;
 
 INSERT INTO emp2 VALUES(1007,'张飞','经理',1009,'2001-09-01',24500.00,NULL,10);

docs/post/8.html

@@ -920,6 +920,7 @@ <h3>4.外键约束</h3>
 <span class="pl-k">INSERT INTO</span> emp <span class="pl-k">VALUES</span>(<span class="pl-c1">1003</span>,<span class="pl-s"><span class="pl-pds">'</span>赵六<span class="pl-pds">'</span></span>,<span class="pl-s"><span class="pl-pds">'</span>开发<span class="pl-pds">'</span></span>,<span class="pl-k">NULL</span>,<span class="pl-s"><span class="pl-pds">'</span>2020-01-01<span class="pl-pds">'</span></span>,<span class="pl-c1">10000</span>.<span class="pl-c1">00</span>,<span class="pl-k">NULL</span>,<span class="pl-c1">30</span>);
 
 <span class="pl-c"><span class="pl-c">#</span>从表 员工表2</span>
+<span class="pl-c"><span class="pl-c">#</span>ON DELETE CASCADE ON UPDATE CASCADE 代表在主表有删除和更新时，从表会对应的删除记录和更新记录</span>
 <span class="pl-k">CREATE</span> <span class="pl-k">TABLE</span> <span class="pl-en">emp2</span>(
 empno <span class="pl-k">INT</span> <span class="pl-k">PRIMARY KEY</span>,
 empname <span class="pl-k">VARCHAR</span>(<span class="pl-c1">20</span>) <span class="pl-k">NOT NULL</span>,
@@ -930,7 +931,6 @@ <h3>4.外键约束</h3>
 COMM <span class="pl-k">DECIMAL</span>(<span class="pl-c1">9</span>,<span class="pl-c1">2</span>),
 deptno <span class="pl-k">INT</span>,
 <span class="pl-k">FOREIGN KEY</span>(deptno) <span class="pl-k">REFERENCES</span> dept(deptno) <span class="pl-k">ON DELETE CASCADE</span> <span class="pl-k">ON</span> <span class="pl-k">UPDATE</span> CASCADE
-<span class="pl-c"><span class="pl-c">#</span>代表在主表有删除和更新时，从表会对应的删除记录和更新记录</span>
 )CHARSET<span class="pl-k">=</span>utf8;
 
 <span class="pl-k">INSERT INTO</span> emp2 <span class="pl-k">VALUES</span>(<span class="pl-c1">1007</span>,<span class="pl-s"><span class="pl-pds">'</span>张飞<span class="pl-pds">'</span></span>,<span class="pl-s"><span class="pl-pds">'</span>经理<span class="pl-pds">'</span></span>,<span class="pl-c1">1009</span>,<span class="pl-s"><span class="pl-pds">'</span>2001-09-01<span class="pl-pds">'</span></span>,<span class="pl-c1">24500</span>.<span class="pl-c1">00</span>,<span class="pl-k">NULL</span>,<span class="pl-c1">10</span>);