Create table … as select语句表示创建表的同时将select的查询结果数据插入到表中,但索引和主外键信息都不会同步过来 mysql> create table customers4 asselect* from customers where cust_idin('10001','10002'); Query OK,2rows affected (0.33sec) Records:2Duplicates:0Warnings:0mysql>select*from customers...
//runnohup ./h1100>> insertmysql.txt |tail -f insertmysql.txt; intmain(intargs,char**argv) {//g++-13 -std=c++23 -I. main.cpp -lmysqlcppconn -o h1;//insert_into_mysql(atoi(argv[1]));select_from_mysql(); std::cout<< get_time_now() <<",finished in"<< __LINE__ <<"o...
select column1, column2 from table where...order bycolumn asc|desc; asc 升序 -- 默认就是升序, desc 降序 对语文成绩排序后输出: select name,chinese from exam order by chinese desc; 对总分排序按从高到低的顺序输出: select name 姓名,chinese+math+english 总成绩 from exam order by 总成绩 des...
CREATE PROCEDURE dbo.Test2 AS CREATE TABLE #t(x INT PRIMARY KEY); INSERT INTO #t VALUES (2); SELECT Test2Col = x FROM #t; GO CREATE PROCEDURE dbo.Test1 AS CREATE TABLE #t(x INT PRIMARY KEY); INSERT INTO #t VALUES (1); SELECT Test1Col = x FROM #t; EXEC Test2; GO CREATE TAB...
Table-valued functions can be invoked where table expressions are allowed in the FROM clause of SELECT, INSERT, UPDATE, or DELETE statements. For more information, see Execute user-defined functions. Interoperability The following statements are valid in a function: Assignment statements. Control-of-...
SELECT Name FROM Production.UnitMeasure WHERE Name = N'Ounces'; GO INSERT INTO Production.UnitMeasure (UnitMeasureCode, Name, ModifiedDate) VALUES ('OC', 'Ounces', GETDATE()); 生成如下错误消息: 输出 复制 Server: Msg 2601, Level 14, State 1, Line 1 Cannot insert duplicate key row in...
使用create table insert select语句创建新表并将数据插入到新表中的步骤如下: 1.创建新表:使用create table语句创建一个新表,指定新表的名称和列的定义。 2.插入数据:使用insert into语句将数据插入到新表中,通过select子句从已有的表中选择要插入的数据。 3.筛选数据:可以使用where子句对要插入的数据进行筛选,...
SELECT * FROM COMPANY WHERE ID IN (SELECT ID FROM COMPANY WHERE SALARY > 45000) ; 1. INSERT 语句中的子查询使用 子查询也可以与 INSERT 语句一起使用。INSERT 语句使用子查询返回的数据插入到另一个表中。 在子查询中所选择的数据可以用任何字符、日期或数字函数修改。
(50), C3 datetime); GO CREATE UNIQUE INDEX AK_Index ON #Test (C2) WITH (IGNORE_DUP_KEY = ON); GO INSERT INTO #Test VALUES (N'OC', N'Ounces', GETDATE()); INSERT INTO #Test SELECT * FROM Production.UnitMeasure; GO SELECT COUNT(*)AS [Number of rows] FROM #Test; GO DROP ...
CTAS on MCD HEAP target tables is not supported. Instead, useINSERT SELECTas a workaround to load data into MCD HEAP tables. Using SSMS forgenerating a scriptto create MCD tables is currently supported beyond SSMS version 19. For details and to understand how to choose the best distribution ...