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...
ON COMMIT PRESERVE ROWS;CREATE GLOBAL TEMPORARY TABLE TEMP_TAB2( table_name VARCHAR2(20), primary_key VARCHAR2(100), field VARCHAR2(1000)) ON COMMIT DELETE ROWS; 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 近年我做的项目中较少使用临时表Temporary Table ,其实 Temp Table 还是可以有比较广泛的...
Sql 语句中 IN 和 EXISTS 的区别及应用 演示demo表: student表 DROPTABLEIFEXISTS`student`; CREATETABLE`student` ( `stuid`varchar(16)NOTNULLCOMMENT'学号', `stunm`varchar(20)NOTNULLCOMMENT'学生姓名', PRIMARYKEY (`stuid`) )ENGINE=InnoDBDEFAULTCHARSET=utf8;...
Applies to: ✅ SQL database in Microsoft FabricThere are many ways to create a table in Fabric SQL database. The primary choices in Fabric include using the SQL editor to create a table, creating a table on load using Fabric Data Flows, or Fabric Data pipelines. For this walkthrough, ...
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...
CREATE DATABASE MyDatabase;创建一个名为 MyDatabase 的新数据库。 USE MyDatabase;切换当前上下文到新创建的数据库。 步骤2:创建示例表 接下来,我们需要创建一个表来存储我们的数据: -- 创建示例表CREATETABLEEmployees(EmployeeIDINTPRIMARYKEY,FirstNameVARCHAR(50),LastNameVARCHAR(50),DepartmentVARCHAR(50))...
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 ...
CREATE TABLE IF NOT EXISTS football_players( id SERIAL PRIMARY KEY, /* Unique identifier for each player (it's possible multiple players have the same name/similiar information) */ name VARCHAR(50) NOT NULL, /* The player's first & last na...