How do I write a case statement in SQLite?

Generally, the SQLite Case statement contains an optional expression followed by one or more WHEN THEN clauses and it is finished with an optional ELSE clause and a required END keyword.

Is SQLite case insensitive?

The default configuration of SQLite only supports case-insensitive comparisons of ASCII characters.

Is SQLite an operator?

An operator is a reserved word or a character used primarily in an SQLite statement’s WHERE clause to perform operation(s), such as comparisons and arithmetic operations. Operators are used to specify conditions in an SQLite statement and to serve as conjunctions for multiple conditions in a statement.

What is question mark in SQLite?

In these statements, you can use a question-mark ( ? ) placeholder where a parameter must be supplied when the statement is executed. OR. Although PreparedStatement objects can be used for SQL statements with no parameters, you probably use them most often for SQL statements that take parameters.

How do I comment in SQLite?

In SQLite, a comment that starts with /* symbol and ends with */ and can be anywhere in your SQL statement. This method of commenting can span several lines within your SQL.

IS NOT NULL in SQLite?

Here is an example of how to use the SQLite IS NOT NULL condition in a SELECT statement: SELECT * FROM employees WHERE employee_id IS NOT NULL; This SQLite IS NOT NULL example will return all records from the employees table where the employee_id does not contain a null value.

How many rows can SQLite handle?

A SQLite database can have maximum 2147483646 pages. Hence the maximum number of tables in a schema cannot reach more than 2147483646. The maximum number of rows in a table is 264.

Is SQLite thread safe?

The Android uses java locking mechanism to keep SQLite database access serialized. So, if multiple thread have one db instance, it always calls to the database in serialized manner and of course database is thread-safe.

How can I learn SQLite?

Beginners Guide to SQLite

No need for servers: That is, there are no server processes that need to start, stop or be configured.
Simple Database Files: A SQLite database is a single ordinary disk file that can be stored in any directory.
Manifest Typing: The majority of SQL database engines rely on static typing.

How do you comment in SQL query?

Comments

Begin the comment with a slash and an asterisk (/*). Proceed with the text of the comment. This text can span multiple lines. End the comment with an asterisk and a slash (*/).
Begin the comment with — (two hyphens). Proceed with the text of the comment. This text cannot extend to a new line.

Is SQL a database?

SQL is the most common language for extracting and organising data that is stored in a relational database. A database is a table that consists of rows and columns. SQL is the language of databases.

What is NULL in SQLite?

SQLite NULL is the term used to represent a missing value. A NULL value in a table is a value in a field that appears to be blank. A field with a NULL value is a field with no value.

How does a case statement work in SQLite?

SQLite provides the case statement that means we can add case expression with conditional logic into the SQL statement. Basically, SQLite case expression executes the list of different conditions and it returns an expression that depends on the outcome of the execution.

What happens when you omit the else clause in SQLite?

In case no expression evaluates to true, the searched CASE expression returns the expression in the ELSE clause if specified. If you omit the ELSE clause, the searched CASE expression returns NULL.

What does the expression evaluate to in SQLite?

The expression is said to evaluate to that value. A literal value is a constant of some kind. Literal values may be integers, floating point numbers, strings, BLOBs, or NULLs.

When to use the optional escape clause in SQLite?

If the optional ESCAPE clause is present, then the expression following the ESCAPE keyword must evaluate to a string consisting of a single character. This character may be used in the LIKE pattern to include literal percent or underscore characters.