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Department table), the insert succeeds: 7, non-null constraintsA non-null constraint (NOT NULL), which can be understood by a name, is a non-null constrained column that must not be empty when inserting a value. Violations of non-null constraints in MySQL, will not error, there will only be warnings, such as the following statement: INSERT INTO employee(id,name,salary,phone,in_dpt) VALUES(03,‘Jim‘,3400,119119,‘dpt2‘); #INSERT成功 age为空，因为没有非空约束，表中显示NU

the table (1) Modify a value in the tableMost of the time we need to make changes not the entire database or the entire table, but one or more of the data in the table, which requires us to use this command to achieve precise modification:UPDATE 表名字 SET 列1=值1,列2=值2 WHERE 条件;For example, we want to change Tom's age to 21,salary to 3000: Note: Be sure to have a where condition, or there will be consequences you don't want to see (2) Delet

Tags: Linux engineer technology Linux Administrator Technology Linux cloud computing engineer Shenzhen Cloud computing Sen Wang Cloud computing operations engineerOn the real machine, use CLONE-VM7 to create a new virtual machine, name: Pxe-server1. Set the firewall to trusted2. Current and permanently closed SELinux3.

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configuration file to create a read-write share[Email protected] ~]# mkdir/test[Email protected] ~]# Vim/etc/exports/test * (rw,sec=krb5p)3. Server-side deployment of encrypted keys# wget Http://172.25.254.254/pub/keytabs/server0.keytab-O/etc/krb5.keytab# Ls/etc/krb5.keytab4. Service end multiplicity from Nfs-server and Nfs-secure-server# systemctl Restart Nfs-server nfs-secure-server5. Service side guarantee Ldapuser0 user has Write permission, set local permissions[Email protected] ~]# setfac

51CTO launches a series of Linux training tutorials (most free of charge), suitable for Linux system management, development, especially for Linux under the system operation and maintenance!through this route map learning, you can quickly and targeted to guide the Linux operations personnel fast growth. ......Introduction to--linux Basics--linux system directory and file permissions understanding--linux System Common Command operationThe construction

:Copy startup-config running-configwriteconfig0x2102EndReload2) Switch:Because the Cisco switch on the Packet Tracer simulator does not have the mode button, the experiment is not supported, and here is just the experimental steps: (This experiment can be done on a real switch)In general, the password recovery technique for a switch or router is to enter privileged mode by setting whether the configuration file is loaded when the device starts, and then copies the boot configuration file to the

.htmlInstructor Profile:Beijing Ping Poly-linuxtone Moderator, real name-Wu Guangko, 51cto-linux Senior operation and maintenance lecturer, from the beautiful Guizhou Small mountain village, unwilling to mediocrity,Focus on automation operations, master LVS, front-end nginx, MySQL cluster, advocating automation operations, simplify the complex problems, the simple problem automation.In large and medium-sized internet companies have served as Linux operations