All of the given options are standard and best practices for SQL.

1. Each table must have a primary key: This is a fundamental rule in SQL. A primary key uniquely identifies each record in a table. It must contain unique values and cannot be null.

2. Use upper case for all SQL keywords: This is a common convention to make SQL statements more readable. SQL is case-insensitive, but using upper case for keywords like SELECT, FROM, WHERE, etc., helps distinguish them from table and column names.

3. Don't use space in identifiers: In SQL, identifiers are names of tables, columns, and other database objects. Using spaces in identifiers can cause confusion and errors. If you need to separate words in an identifier, use an underscore (_) instead of a space.

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All of the given options are standard and best practices for SQL.

1. Each table must have a primary key: This is a fundamental rule in SQL. A primary key uniquely identifies each record in a table. It must contain unique values and cannot be null.

2. Use upper case for all SQL keywords: This is a common convention to make SQL statements more readable. SQL is case-insensitive, but using upper case for keywords like SELECT, FROM, WHERE, etc., helps distinguish them from table and column names.

3. Don't use space in identifiers: In SQL, identifiers are names of tables, columns, and other database objects. Using spaces in identifiers can cause confusion and errors. If you need to separate words in an identifier, use an underscore (_) instead of a space.

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All of the given options are standard and best practices for SQL.

1. Each table must have a primary key: This is a fundamental rule in SQL. A primary key uniquely identifies each record in a table. It must contain unique values and cannot be null.

2. Use upper case for all SQL keywords: This is a common convention to make SQL statements more readable. SQL is case-insensitive, but using upper case for keywords like SELECT, FROM, WHERE, etc., helps distinguish them from table and column names.

3. Don't use space in identifiers: In SQL, identifiers are names of tables, columns, and other database objects. Using spaces in identifiers can cause confusion and errors. If you need to separate words in an identifier, use an underscore (_) instead of a space.

Which of these are standard and best practises for SQL?Select one:All of the given optionsEach table must have a primary key.Use upper case for all SQL keywords.Don't use space in identifiers.

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