Course Intermediate 10914
Course Introduction:"Self-study IT Network Linux Load Balancing Video Tutorial" mainly implements Linux load balancing by performing script operations on web, lvs and Linux under nagin.
Course Advanced 16847
Course Introduction:"Shangxuetang MySQL Video Tutorial" introduces you to the process from installing to using the MySQL database, and introduces the specific operations of each link in detail.
Course Advanced 10562
Course Introduction:"Brothers Band Front-end Example Display Video Tutorial" introduces examples of HTML5 and CSS3 technologies to everyone, so that everyone can become more proficient in using HTML5 and CSS3.
MySQL Error 150: Troubleshooting foreign key constraints when creating table
2023-10-16 16:59:12 0 1 693
How to query the foreign key name in MYSQL
Why can't I get the foreign key name?
2018-06-21 17:49:27 0 1 1085
Adding foreign key columns to a MySQL table: step-by-step guide
2023-10-29 18:54:01 0 2 541
MYSQL I want to know how to query the name of the foreign key
2018-06-21 17:54:54 0 2 1023
Course Introduction:How to realize automatic connection between MySQL foreign keys and primary keys? MySQL is a popular relational database management system that supports the use of foreign keys and primary keys to establish relationships between data tables. In database design, foreign keys and primary keys are very important concepts, they can help ensure the integrity and consistency of data. So, how to implement automatic connection between foreign keys and primary keys in MySQL? Next, we will introduce it in detail through specific code examples. First, let us understand the definition and role of foreign keys and primary keys: Primary key (P
2024-03-16 comment 0 387
Course Introduction:Let us understand how to use foreign keys in MySQL − InnoDB tables support checking foreign key constraints. No foreign key constraints are required to join the two tables. It can be used when defining the columns that need to be used, for storage engines other than InnoDB. REFERENCEStableName(colName) has no practical effect other than to annotate to the user that the column currently being defined is intended to reference a column in a different table. MySQL does not check to make sure 'colName' actually exists in 'tableName', or that 'tableName' itself actually exists. In the parent table, the foreign key will act as the primary key. Let's see an example of creating a table. Create subtable mysq
2023-08-31 comment 0 1304
Course Introduction:MySQL foreign keys and primary keys can be automatically connected. The points to note are: 1. Foreign keys and primary keys must be defined as the same data type and size in the relevant tables; 2. Foreign keys and primary keys must be used under the InnoDB storage engine; 3. The connection operation of foreign keys and primary keys needs to be performed when creating the table and cannot be added to an existing table.
2023-07-20 comment 0 1202