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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.
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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.
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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.
List of constraints in the database
How to get list of all constraints from MySQL database?
2023-08-22 15:07:48 0 1 442
MySQL constrains unique index only if another column is empty
2024-01-16 15:42:42 0 2 410
Duplicate constraint error when using laravelsyncWithPivotValue method
2023-09-14 10:25:33 0 1 452
Cannot drop index '*': required -> in foreign key constraint but which one?
2024-03-25 23:27:49 0 2 326
Course Introduction:We know that a constraint is a limitation or limitation. Similarly, MySQL constraints are used to define rules that limit the data that can enter a table. With the help of constraints, we can basically maintain the accuracy and integrity of the data within the table. Types of MySQL Constraints There are two types of MySQL constraints − Column-level constraints − Constraints that apply only to a specific column of the table and restrict the column data are called column-level constraints. Table-level constraints − Constraints that apply to the entire table and restrict the data of the entire table are called table-level constraints. Here are some of the most common MySQL constraints − NOTNULL UNIQUE PRI
2023-08-24 comment 0 1194
Course Introduction:Common constraints in MySQL include: primary key constraints, foreign key constraints, unique constraints, non-null constraints, auto-increment constraints and check constraints. These constraints help ensure data integrity, improve data quality, maintain relationship integrity, and enhance performance.
2024-05-01 comment 0 1053
Course Introduction:MySQL provides 10 constraint types: primary key constraints, foreign key constraints, unique key constraints, non-null constraints, check constraints, default value constraints, auto-increment constraints, cascade constraints, index constraints and space constraints to ensure data consistency. Completeness and validity.
2024-04-27 comment 0 971
Course Introduction:The relationship between primary key constraints and unique constraints in MySQL: Primary key constraints require column values to be unique and non-null; unique constraints allow null values but prevent duplicate rows.
2024-04-27 comment 0 590