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MySQL View Character Set And Collation Rules

In MySQL, you can view the character set and collation settings at different levels - server, database, table, and column - using various SQL commands.

Server Level: You can check the server-level character set and collation by running the following commands:
```
SHOW VARIABLES LIKE 'character_set_server';
SHOW VARIABLES LIKE 'collation_server';
```
Database Level: To check the character set and collation for a specific database, run:
```
SELECT default_character_set_name, default_collation_name
FROM information_schema.SCHEMATA
WHERE schema_name = 'database_name';
```
Replace 'database_name' with the name of your database.
Table Level: To check the character set and collation for a specific table, run:
```
SELECT table_collation 
FROM information_schema.TABLES 
WHERE table_schema = 'database_name' 
AND table_name = 'table_name';
```
Replace 'database_name' and 'table_name' with the name of your database and table, respectively. This query will return the collation of the table; the character set can be deduced from the collation.
Column Level: To check the character set and collation for a specific column in a table, run:
```
SELECT character_set_name, collation_name 
FROM information_schema.COLUMNS 
WHERE table_schema = 'database_name' 
AND table_name = 'table_name' 
AND column_name = 'column_name';
```
Replace 'database_name', 'table_name', and 'column_name' with the name of your database, table, and column, respectively.

By using these commands, you can view the character set and collation settings at different levels in MySQL. Understanding these settings is important because they affect how text data is stored, compared, and sorted in your database.

Setting character set and collation for MySQL views:
- Set the character set and collation for a view by ensuring consistency with the underlying tables:
```
CREATE VIEW your_view AS
SELECT column_name FROM your_table
WHERE column_name = 'value' COLLATE utf8mb4_general_ci;
```

View creation with a specific character set in MySQL:

Specify the character set during view creation:

CREATE VIEW your_view AS
SELECT column_name FROM your_table
WHERE column_name = 'value' COLLATE utf8mb4_general_ci;

MySQL view collation for string comparisons:
- Collation settings influence string comparisons in MySQL views. Adjust collation to control comparison behavior:
```
CREATE VIEW your_view AS
SELECT column_name FROM your_table
WHERE column_name = 'value' COLLATE utf8mb4_bin;
```

MySQL view creation with utf8mb4 character set:

Explicitly set the character set during view creation:

CREATE VIEW your_view AS
SELECT column_name FROM your_table
WHERE column_name = 'value' COLLATE utf8mb4_general_ci;