to use exist or exists

Use the shell script to monitor if the process has an instance that does not exist, starting with code dry:#!/bin/shPs-fe|grep processstring |grep-v grepIf [$?-ne 0]Thenecho "START process ..."Elseecho "Runing ..."Fi#####Processstring represents a

Use shell script to monitor whether a process exists without a startup instance, first on the code dry: #!/bin/shPs-fe|grep processstring |grep-v grepIf [$?-ne 0]Thenecho "START process ..."Elseecho "Runing ..."Fi#####Processstring represents a

When the MySQL record does not exist, insert. When the record exists, there are basically three solutions to update the internet. First: Example 1: insert multiple records. Suppose There Is A client_id table with the primary key, you can use the

Let's take a look at the following example: Two system tables in Oracle. emp, dept. example: 1: not exists (not in) Not exists: This statement returns the result set that the select * from scott. dept d where e. deptno = d. deptno and d. deptno = 10

MySQL insert when the record does not exist, update when the record exists, mysqlinsert   There are basically three solutions on the Internet. First: Example 1: insert multiple records Suppose there is a clients table with the primary key of

SQL server to determine whether a table or temporary table exists, SQL server 1. Determine whether a data table exists Method 1: Use yourdb; goif object_id (N 'tablename', N 'U') is not nullprint 'There is 'else' print' doesn't exist' For

The idea is to write a function to query the data conditionally, if the query to the data is updated, if no query to the data is inserted:Create or Replace function Fn_merge_index (statdate in date, cpid in VARCHAR2, Indextypecode in number, Inde

1, to determine whether the data table exists Method One: Use Yourdb; Go if OBJECT_ID (n ' tablename ', n ' U ') are NOT null print ' exists ' else print ' does not exist ' For example: Use Fireweb; Go if object_id (n ' temp_

Get the root directory method of the console application1:environment.currentdirectory Gets or sets the fully qualified path to the current working directory2:appdomain.currentdomain.basedirectory gets the base directory, which is used by the

Started thinking that, like SQL Server, using not exists to judge, the result is not:IF not EXISTS(SELECT 1 fromVrv_paw_templateWHERETemplateName='Custom' ORTemplatefilename='Policycustom'LIMIT1)INSERT intoVrv_paw_template