Predicates are found in the WHERE, HAVING, or ON clauses of SQL statements; they describe attributes of data. The following query returns the expected result: The following query will return the last record from the Worker table: Let us take a pause here. Some general SQL guidelines apply, and there are also specific practices that apply only to DB2. You need a so-called "common table expression" for that. The general query to clone a table with data is: The general way to clone a table without information is: An alternate way to clone a table (for MySQL) without is: Following MySQL query returns the current date: Following MySQL query returns the current date and time: Following SQL Server query returns the current date and time: Following Oracle query returns the current date and time: Following MySQL query will return the top n records using the LIMIT method: Following SQL Server query will return the top n records using the TOP command: Following Oracle query will return the top n records with the help of ROWNUM: The following MySQL query returns the nth highest salary: The following SQL Server query returns the nth highest salary: The following query is using the correlated subquery to return the 5th highest salary: Use the following generic method to find nth highest salary without using TOP or limit. Solving practice questions is the fastest way to learn any subject. DB2 SQL Programming is the query language used to query the DB2. Ans. And since DB2 uses standard SQL for the most part, any good SQL reference (book or web) will give you plenty of queries to practice with. I don't have a DB2 for z/OS availabe and cannot test, but here is the link to the documentation of common table expressions incl. Each part will contain list of 50 SQL Queries for Practice. The DB2 Predicates affect how DB2 selects the access path for the statement. Info This tutorial is NOT a DB2 DBA tutorial and it is not related to Database administration. Robert Sample Global moderator This flexibility also means that some queries are better than others in taking advantage of the Db2 optimizer's strengths. Sure, this will help crack your interviews. If you want to improve SQL skills, then install a SQL package like MySQL and start practicing with it. You can improve how DB2 processes SQL statements by following certain practices when writing predicates. SQL Queries for Interviews. So if you are interested, then follow the link given below. To get you going with practicing SQL in local database on your computer, we have put together list of 200 SQL and PLSQL Queries for Practice.Since we don’t want to make each post... Hi there, I am Lyoid Lopes. Write an SQL query to fetch “FIRST_NAME” from Worker table using the alias name as . In practice, you can think of the reason being that the where is parsed before the select, so the aliases are not known. Using Binary operator will make INSTR work as the case-sensitive function. 1) What are the different SELECT statements? Try to find answers on your own. 3 SELECT from Nobel Additional practice of the basic features using a table of Nobel Prize winners. The required query is: Select FIRST_NAME AS WORKER_NAME from Worker; Q-2. 238 Top SQL Queries for ETL/Oracle/DB2 Developers. A relational database is based on the principle of relation and relation can be anything. Making predicates eligible for expression-based indexes You can create an expression-based index to improve the performance of queries that use column-expression predicates. The db2tutorial.com website provides a comprehensive Db2 tutorial that includes practical examples and many hands-on activities. So, you can use them to create a test database and tables. Since clients have many different DB2 SQL tips, I’ve listed below 10 performance guidelines that have helped my clients and will hopefully be beneficial to your developers. Create various database objects including tables, views, stored procedures, and triggers. 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