合并数据//横向1:1合并// merge 1:1 Symbol using "F:\1A研究生资料\研究生作业\石老师作业\合并数据\DCG.dta" drop if_merge==2//去掉没有对应到的数据==2新合并的文件没有匹配到的数据// drop if merge ==1 //去掉没有对应到的数据==1原合并的文件没有匹配到的数据// drop _merge sum //sym...
drop if x<0\ drop in 1/100 drop if x==.|y==. drop _all //清空数据库 13、keep: 与drop对应,保存变量 14、append:纵向连接数据库 15、merge:横向连接数据库 16、gen: 生成新变量 gen bh=_n //将数据库的内部编号赋给变量bh 17、replace:更改变量值 replace z=. if z=9 //将所有z=9的...
True when IF EXISTS construct is used. C# 复制 public bool IsIfExists { get; set; } Property Value Boolean Applies to 产品版本 Microsoft.SQLServer.DacFx 140.3881.1, 150.18208.0, 160.2004021.0, 161.6374.0, 161 本文内容 Definition Applies to ...
Package: Microsoft.SqlServer.TransactSql.ScriptDom v161.8901.0 True when IF EXISTS construct is used. C# 複製 public bool IsIfExists { get; set; } Property Value Boolean Applies to 產品版本 Microsoft.SQLServer.DacFx 140.3881.1, 150.18208.0, 160.2004021.0, 161.6374.0, 161 本文...
After you create a flag it is possible to set the pflag.NoOptDefVal for the given flag. Doing this changes the meaning of the flag slightly. If a flag has a NoOptDefVal and the flag is set on the command line without an option the flag will be set to the NoOptDefVal. For examp...
DROP TABLE [ IF EXISTS ]name[, ...] [ CASCADE | RESTRICT ] Parameters IF EXISTS Clause that indicates that if the specified table doesn’t exist, the command should make no changes and return a message that the table doesn't exist, rather than terminating with an error. ...
droptable[ifexists] ; 参数说明 if exists:可选。如果不指定if exists且表不存在,则返回异常。如果指定if exists,无论表是否存在,均返回成功。 table_name:必填。待删除的表名。 使用示例 --删除表sale_detail。无论sale_detail表是否存在,均返回成功。droptableifexistssale_detail; 相关命令 CREATE...
3、示例 以下示例演示DROP命令的使用,依次执行如下SQL语句: --删除整个表course DROP TABLE IF EXISTS course--创建course表 CREATE TABLE course(cid VARCHAR(10),cname VARCHAR(10),teid VARCHAR(10));--初始化数据 INSERT INTO course VALUES('01','语文','02'); ...
If your DROP formula is configured to remove all or more rows or columns than there are in the array, a #CALC! error will indicate that there is nothing to return. Not enough blank cells to output the results In case there are not enough empty cells below or/and to the right of the...
Pre-compiled binaries can be found inLatest Release. If you are building directly from the source, please referBUILD.md. Installing using Homebrew on macOS/Linux First, you need to install Homebrew. Please refer the instruction onthe official site. Then run following commands to install watermint...