AI代码解释 create table#t1(c1 int,c2 int);create table#t2(c1 int,c2 int);insert into #t1values(1,2);insert into #t1values(1,3);insert into #t2values(1,2);insert into #t2values(1,null);select*from #t1 where c2 notin(select c2 from #t2);-->执行结果:无 select*from #t1 wher...
It’s now time for you to design and create your own table. While the SQL Interpreter on this page does not support creating a table on this website, the following lessons will provide example templates for use as a comparison and sense check. Create Table Exercise You have just started a...
2、null值问题 createtableA(id1int)createtableB(id2int)insertintoA(id1)values(1),(2),(3)insertintoB(id2)values(1),(2) 第一次查询的sql selectid1fromAwhereid1notin(selectid2fromB) 结果是 id 3 当给B插入一个空值,同样第二次执行子查询语句 insertintoB (id2)values(NULL) 结果是为空...
INSERT INTO TableIn (ANAME,ASEX) SELECT top 1 '张三', '男' FROM TableIn WHERE not exists (select * from TableIn where TableIn.AID = 7) EXISTS与IN的使用效率的问题,通常情况下采用exists要比in效率高,因为IN不走索引,但要看实际情况具体使用: IN适合于外表大而内表小的情况;EXISTS适合于外表小...
DB2 creat新表 db2 create table in AI检测代码解析 Session session = getHibernateTemplate().getSessionFactory().openSession(); Transaction tx = session.getTransaction(); tx.begin(); Connection con=session.connection(); String procedure = "{call BONUS_TIME(?,?,?,?,?,?) }";...
CREATE TABLE `t_poetry` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `poetry_id` bigint(20) NOT NULL COMMENT '诗词id', `poetry_name` varchar(200) NOT NULL COMMENT '诗词名称', `author_id` bigint(20) NOT NULL COMMENT '作者id' PRIMARY KEY (`id`), UNIQUE KEY `pid_idx` (`poetry...
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在一次准备处理历史数据sql时,出现这么一个问题:You can't specify target table '表名' for update in FROM clause,大致的意思就是:不能在同一张表中先select再update。 在此进行一下复盘沉淀,使用测试sql复现当时的场景(mysql是8版本),准备测试数据: ...
CREATE TEMPORARY TABLE temp_ids (id INT PRIMARY KEY); INSERT INTO temp_ids VALUES (1),(2),(3),...,(10000); -- 关联查询 SELECT t.* FROM main_table t JOIN temp_ids tmp ON t.id = tmp.id; 3.3 UNION ALL方案 SELECT * FROM table WHERE id IN (1,2,...,500) UNION ALL SELECT...
I have a mySQL or phpMyadmin table (nor sure) (with longblob fields) that I want to convert to SQL Server. Here is a link to a Rar with two files, the 'ORIGINAL CODE.sql' is the original code sample and the 'NEW_SQL_CODE.sql' is the code I am writing in SQL to create a ...