The execution block contains all the code that needs to be executed, including the EXIT condition. The LOOP keyword declares the beginning of the loop, and END LOOP declares the end of the loop. ![]() SELECT last_name, job_id, salary,ĮLSE salary END "REVISED_SALARY" FROM employees For all other job roles, there is no increase in salary. We can use CASE to evaluate multiple conditions for a single variable, “job_id.” If “job_id” is “ACCOUNT,” the salary increase is 10% if “job_id” is “IT_PROG,” the salary increase is 15% if “job_id” is “SALES,” the salary increase is 20%. Introduction to PL/pgSQL Loop statement The loop defines an unconditional loop that executes a block of code repeatedly until terminated by an exit or return statement. SAP Adaptive Server Oracle MySQL open source PostgreSQL. The optional label can be used by EXIT and. It facilitates conditional inquiries by doing the work of an IF-THEN-ELSE statement and applying it to many possible conditions. LOOP defines an unconditional loop that is repeated indefinitely until terminated by an EXIT or RETURN statement. The while loop statement executes a block of code till the condition remains true and stops executing when the conditions become false. The CASE statement uses IF-THEN-ELSE logic within a single statement. PostgreSQL provides the loop statement which simply defines an unconditional loop that executes repeatedly a block of code until terminated by an exit or return statement. Next, there is one condition: when x is greater than y it raises notice that “x is greater than y.” When that condition is not met, it raises the notice “x is not greater than y.” In this case, the condition is not met, so the ELSE clause is executed and the output for the ELSE part is printed. The SELECT INTO statement assigns the result of multiple columns (but only one row) into a record variable or list of scalar variables. If the condition is false then it goes to the next statement after END IF.Īs in the first example, here 2 variables are declared at the start: x=10 and y=20. The IF condition runs when a condition is evaluated as true. In this article, we will learn what is looping, why it is required, and the various types of looping statements, and how we can use for loop in PostgreSQL functions to achieve our intention or get our work done. ![]() There are three main types of control structures available with PostgreSQL to use with stored procedures: IF, CASE, and LOOP. Introduction to PostgreSQL For Loop In the PostgreSQL database, we can use many conditional and looping statements. ![]() Stored procedures in PostgreSQL are ones that define a function for creating triggers or custom functions. SUMMARY: This article reviews control structures that can be used in PostgreSQL stored procedures, with syntax and examples provided for each.
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