Common symbols in SQL:

1, = means equal to.

2.<& gt means not equal to.

3、gt； Means greater than.

4.< means less than.

5、gt； = means greater than or equal to.

6

1, = means equal to.

2.<& gt means not equal to.

3、gt； Means greater than.

4.< means less than.

5、gt； = means greater than or equal to.

6. < = means less than or equal to.

7. It means within a certain range.

Extended data:

Commonly used SQL statements:

1. Displays the database list in the current database server: MySQL >；; Displays the database. Note: mysql library contains MYSQL system information. We actually use this library to change passwords and add new users.

2. Enter the database: mysql & gt uses the library name.

3. Display the data table in the database: MySQL >；; Show the table.

4. Display the structure of the data table: mysql & gt describes the table name.

5. Establish a database: mysql & gt creates the name of the database library.

6. Establish a data table: mysql & gt uses the library name; Mysql & gt creates a table name (field name VARCHAR(20), field name CHAR( 1)).

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