Does SQLite support if?

Summary: in this tutorial, you will learn about the SQLite IIF() function that allows you to add the if-else logic to queries.

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.

What is CASE statement in SQLite?

The SQLite CASE expression evaluates a list of conditions and returns an expression based on the result of the evaluation. The CASE expression is similar to the IF-THEN-ELSE statement in other programming languages. You can use the CASE expression in any clause or statement that accepts a valid expression.

How do I use Isnull in SQLite?

The SQLite ifnull function allows you to return an alternate value if expression1 is NULL. In other words, it will return the first non-null expression which is the same as using the coalesce function with 2 parameters.

Does SQLite support concurrency?

SQLite does support multiple concurrent connections, and therefore it can be used with a multi-threaded or multi-process application. The catch is that when SQLite opens a write transaction, it will lock all the tables.

Should I use NULL or empty string?

Null can be a unknown value or an absence of a value, where as an Empty or Blank string is a value, but is just empty. Null can be used for string , Integer ,date , or any fields in a database where as Empty is used for string fields.

How do you check if a column is NULL?

SELECT * FROM yourTableName WHERE yourSpecificColumnName IS NULL OR yourSpecificColumnName = ‘ ‘; The IS NULL constraint can be used whenever the column is empty and the symbol ( ‘ ‘) is used when there is empty value.

Can I use if statement in SQL?

CASE vs IF Statement. Database developers get confused between CASE and IF statement.

What is if statement in SQL?

The Transact-SQL statement that follows an IF keyword and its condition is executed if the condition is satisfied: the Boolean expression returns TRUE. The optional ELSE keyword introduces another Transact-SQL statement that is executed when the IF condition is not satisfied: the Boolean expression returns FALSE.

What is the difference between SQLite and MySQL?

The big difference is SQLite is a app-resident library, while MySQL is typically used as a client-server DBMS where the client process interacts with the DB server process using some sort of networking. (Note that MySQL does have an app-resident usage mode, but it has a much bigger footprint than SQLite.)

When to use case when in SQL?

CASE expression is widely used to facilitate determining / setting a new value from user input values. CASE expression can be used for various purposes which depends on the business logic. CASE expression is mostly used in SQL stored procedure or as a formula for a particular column, which optimizes the SQL statements.