How add if in SQL query?

How do I add an IF condition in SQL query?

You can use CASE to implement IF-THEN-ELSE in PL/SQL – this is just an example: select case field1 WHEN ‘1’ THEN ‘VALUE1’ WHEN ‘2’ THEN ‘VALUE2’ ELSE ‘VALUEOTHER’ END, case field2 WHEN ‘1’ THEN ‘VALUE1’ WHEN ‘2’ THEN ‘VALUE2’ ELSE ‘VALUEOTHER’ END from ( select ‘1’ “FIELD1”, ‘2’ “FIELD2” from dual );

Can you use if in select statement?

We can conveniently use it when we need to decide between two options. There are three parts in IIF statement, first is a condition, second is a value if the condition is true and the last part is a value if the condition is false.

How do you do multiple If in SQL?

END TRY BEGIN CATCH SELECT ERROR_MESSAGE() AS ‘Message’ RETURN -1 END CATCH END –The above works I then insert this below and these if statement become nested—- IF(@A!= @SA) BEGIN exec Store procedure @FIELD = 15, … more params… END IF(@S!= @SS) BEGIN exec Store procedure @FIELD = 10, … more params…

Is there an IF function in SQL?

IF statements can be used to conditionally enter into some logic based on the status of a condition being satisfied. The IF statement is logically equivalent to a CASE statements with a searched-case-statement-when clause. An END IF clause is required to indicate the end of the statement. …

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How do I write if else in MySQL?

The syntax for the IF-THEN-ELSE statement in MySQL is: IF condition1 THEN {… statements to execute when condition1 is TRUE…} [ ELSEIF condition2 THEN {…

How do I write an if statement in Oracle?

The syntax for IF-THEN-ELSE in Oracle/PLSQL is: IF condition THEN {… statements to execute when condition is TRUE…} ELSE {… statements to execute when condition is FALSE…}

What is IIF SQL Server?

IIF is a shorthand way for writing a CASE expression. It evaluates the Boolean expression passed as the first argument, and then returns either of the other two arguments based on the result of the evaluation.

How write if exists in SQL Server?

The following code does the below things for us:

  1. First, it executes the select statement inside the IF Exists.
  2. If the select statement returns a value that condition is TRUE for IF Exists.
  3. It starts the code inside a begin statement and prints the message.

How if else works SQL?

The SQL Server else if statement handles multiple statements effectively by executing them sequentially. It will check for the first condition. If the condition is TRUE, then it will execute the statements present in that block. … Because ELSE IF conditions only execute if it’s previous IF or ELSE IF statement fails.

How do I check if a SQL query is correct?

To verify a query i use the EXPLAIN command. You can take any SQL query and add EXPLAIN before it and execute. If query is wrong, error will be returned.

How does decode work in SQL?

DECODE compares expr to each search value one by one. If expr is equal to a search , then Oracle Database returns the corresponding result . If no match is found, then Oracle returns default . If default is omitted, then Oracle returns null.

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