Although some Oracle tools and applications mask SQL use, all database operations are performed using SQL. Query for 3rd highest salary. “We expect to see the order of the values as 1,1a,2,2a,3,3a…. 0, [sql]select mod(num,1) from test_decimal; INSERT INTO update_using VALUES(5,13); Answer : Here 2 has two corresponding values 12 and 13. [sql]create table test_marks(subject varchar2(10), 00b If a number is 1.980 then the output should be 0.980, [sql]CREATE TABLE test_decimal(num NUMBER); [sql]GRANT user1 TO user2 WITH MANAGER OPTION;[/sql] 24. 20 10 4.9 4 3.23333333 3 2.4 2 0 kcksX 4 1.9 1 1.23333333 1 0.9 0 11 11 0 INSERT INTO to_update VALUES(5,NULL); [sql]SELECT * FROM (SELECT CASE WHEN MOD(LEVEL,4)=1 THEN LEVEL END seq FROM dual 31 2 0, Step 5. Here I am just displaying the two columns we created earlier. Oracle SQL Developer provides a SQL Worksheet that you can use to query data, by writing simple or complex SQL statements. trigger to update the value of total as sum of marks1, marks2, marks3 6 2.9 2 1.9 1 1.4 1 31b 3 1 Design the solution of the required scenario and develop working code. BEGIN WHERE t.col1=col3 AND col4 NOT IN 0a 1 I am writing some queries which were asked of me during my interview -- the questions asked in each interview are different but I understand they are related to each other. 7/5/2011 5:22:14 PM 0 0 7/5/2011 (EVEN NUMBERED) select * from emp where rowid in (select decode(mod(rownum,2),0,rowid, null) from emp); To select ALTERNATE records … …, [sql]SELECT * FROM (SELECT CASE WHEN MOD(LEVEL,5)=1 THEN LEVEL END seq FROM dual 6/17/2011 Try running the query without using NULLS FIRST and you will know the reason it has been kept there. Add 1 to the end_index in the above query and take it as the start index. SET col2 =col4 This is the second row in the final query (B). What is Cartesian Product ? You might … 8 a This project will provide you each and everything related to databases. 3a Change ). 1 31. 2 WHERE a.col1 =b.col3 ) INSERT INTO test_decimal VALUES(100); 3 1.4 1 0.9 0 0.65 0 31 31. 7/5/2011 5:22:14 PM 2 14 6/21/2011 20 20 Considering the database schema displayed in the SQLServer-style diagram below, write a SQL query to return a list of all the invoices. 20.099 Instead of first day this query returns last day of … 6/14/2011 1a 2 1 :new.total := :new.marks1+:new.marks2+:new.marks3; 10b 3 1 0 Tricky SQL Query Hi Tom,I have scenario like , For example I have table with a Column of values 1,2,3,4,5 but i need the output like 2,3,4,5,1, for this i found one solution but i hope this is not the generic one, could you please help me.., Below i have explained scenario with the exampleCREATE TABLE TE GROUP BY clause concept – Group Functions MAX, MIN, SUM, AVG, COUNT – Group function tricky queries Analytical / Aggregate form of Function – ROLLUP, CUBE, RANK, DENSE_RANK, DECODE vs CASE SQL General Functions – Conversion, Numeric, String, Date functions – Query examples 11 5.4 5 3.56666666 3 2.65 2 [sql] SQL> SELECT translate(tno,’0123456789′,’000000000′) q,REPLACE(translate(tno,’0123456789′,’000000000′),’0′,”) FROM ting; Q REPLACE(TRANSLATE(TNO,’0123456 But the above query will fail if you add another row : This is how I understood the final query. Answer: Oracle is one of the popular databases … 7/5/2011 5:22:14 PM 5 35 5/31/2011 1 1 For this to work, we need to have a primary key on the table from which we are updating(update_using). A database is an organized collection of data, stored and retrieved digitally from … WHERE seq IS NOT NULL[/sql], This is generate numbers with interval of 5. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. insert into ting values(’31b’); END;[/sql]; Note: AFTER INSERT will not work in this case. INSERT INTO update_using VALUES(1,11); While creating an index, we can specify conditional statements. View the answer → Edited by: Frank Kulash on Dec 18, 2008 8:17 PM To be more precise: column names and aliases must be hard-coded into the query. 1.Generate numbers/sequence using dual with a specific interval. 0a 1 1 1 5 13 ( Log Out /  WAcca To ensure the best results, the professional has outlined what you need to provide before they can start the project. 2. Database creation and data population script (if available), Access to the environment having one premises installed database (in case there are some limitations to share the db script). 00. We must … 3 SET col2 =col4 Change ), You are commenting using your Twitter account. 14 6.9 6 4.56666666 4 3.4 3 31b [sql] SQL> SELECT translate(tno,’0123456789′,’000000000′) q,length(REPLACE(translate(tno,’0123456789′,’000000000′),’0′,”)) FROM ting; Q LENGTH(REPLACE(TRANSLATE(TNO,’ 13 6.4 6 4.23333333 4 3.15 3 11 11 Sql Tricky Queries select parent_id who have at least one boy and one girl ... having count (distinct child_gender) = 2. I also have experience in writing complex queries in optimized way. ———- —————————— To generate multiples of a number using dual in ORACLE. 2 ROWNUM/3-0.1 b, trunc(ROWNUM/3-0.1) three, For some reason[must be a broken tag/code], I cannot put more text into the original page Tricky SQL queries, advanced SQL queries, Interesting SQL queries. 10b 3 1 4. Oracle SQL Architecture Questions SQL Tricky Queries SQL Advanced Topic Questions Questions from past 30+ Interviews Instructor is a Oracle Certified Professional (OCP) Instructor has Points: 12,975 Level: Master in Oracle Technology Network (OTN) 12 00 9 4.4 4 2.9 2 2.15 2 For each invoice, show the Invoice ID, the billing date, the customer’s name, and the name of the customer who referred that customer (if any). 3 3 marks1 number, marks2 number, marks3 number, total number)[/sql], On insert, the trigger should automatically calculate the sum of marks1, marks2 and marks3 and assign it to total column: INSERT INTO to_update VALUES(6,NULL); SQL (pronounced sequel) is the set-based, high-level declarative computer language with which all programs and users access data in an Oracle database. You will get tricky and advanced SQL queries for Oracle, SQL Server, MySql and Postgres Ibrahim P. 4.9 (154 reviews) Share Select service tier. as it will not know which value of col4 should be used to update col2. Generate numbers/sequence using dual with a specific interval. A privilege is nothing but right to execute an SQL query or to access another user object. 12 b 13 rows selected 2 substr(tno,length(tno)-nvl(length(replace(translate(tno,’0123456789′,’0000000000′),’0′,”)),0) +1 ) b, Tricky SQL queries advanced SQL queries, Interesting SQL queries 2 1 . 20 9.9 9 6.56666666 6 4.9 4. 7/2/2011 “, [sql]create table ting(tno varchar2(4)); 0 10a 3 ROWNUM/4-0.1 c, trunc(ROWNUM/4-0.1) four You can skip the following sections and directly go for the final solution. 9 Step 7. Tuning SQL queries with date ranges, such as: and start_date between to_date ( :st_dt, 'YYYY-MM-DD' ) and to_date ( :en_dt, 'YYYY-MM-DD' ) Is tricky. trunc(SYSDATE-(7*(LEVEL-1))) t FROM dual 7 Column A in step 5 and column B in step 6 along with the original column tno. select m.item, m.location, (CASE WHEN m.card like t.card THEN m.card ELSE 'All' END) as card from mst_item as m, time_factor as t WHERE m.location like t.location ORACLE QUERY 2 2 Find the total length (length(tno))of the string and using NVL replace the null values in the above query with 0. 5 —- —- —- To make this query work, create a primary key on update_using : A rough overview the professional has created to outline how the project would progress. The following steps are a breakdown of the final solution. [sql] SYSDATE LV S T After we showed you 10 main questions asked to a candidate on JavaScript interviews, we found an interesting material with SQL tricky questions. 5 ORDER BY to_number(a),b NULLS FIRST In this case since 11 is already present in to_update table, it should not be updated for 1 in to_update table. 00b b 0 00 CONNECT BY LEVEL <10, dt 00 00b 1 [sql] SQL> SELECT rownum, —- —————————— ... (SQL Server Query) SELECT SYSDATE FROM DUAL à This Oracle query returns the current date and time 19. SQL Tricky Questions TheDataMonk Master March 25, 2019 Uncategorized 2 Comments 812 views. 2 00. 0a a 0a a 1 what is in T2 and you join T2 to T1 by T1’s primary key. insert into ting values(’10’); 10 a 10a ADD CONSTRAINT up_us_pk PRIMARY KEY(col3)[/sql]. 2a 2 1 1 31 31 WHERE a.col1 =b.col3 ) 10 10 In this session we discussed why this is a hard problem. 2 10 a 10a See the output to get a better understanding of the requirement. 1 0.4 0 0.23333333 0 0.15 0 EyoQl[/sql], To know more about generating random numbers and strings, you can check this post 0 20 2 0 5 ; update(SELECT a.col1,a.col2,b.col3,b.col4 FROM to_update a,update_using b Analyze the current scenario and problems to identify the functional and non functional requirements. ———- —- ddhmo 6/23/2011 1.12357 10 a 6 a [sql]INSERT INTO test_marks(subject,marks1,marks2,marks3) INSERT INTO update_using VALUES(2,12); [/sql] ….. ****************************************************. 1 a 1a insert into ting values(’10a’); There is a database limit which only allows at the most 32760 characters to be written at one time. So, You still have the opportunity to move ahead in your career in Oracle PL SQL Development. Creating a GENERIC GROUP BY Procedure PL/SQL. zodaY These SQL queries for Interviews are important for fresher’s as well as the experienced professionals, which have good experience. 6/20/2011 9 a Use substr to display only the alphabets. There are 4 columns in a table, marks1, marks2,marks3 and total. 6/29/2011 Using Filter Index. http://oddabout.com/?p=594, 5. SRAVAN ORACLE APPS HRMS Friday, November 28, 2014. Explain Scalar functions. N'th highest Salary? Another one from asktom . 100[/sql]. …. Introduction to SQL. 5 2.4 2 1.56666666 1 1.15 1 This is a continuation of that page. [sql]select DBMS_RANDOM.STRING(‘A’,5) ran from dual connect by level< 10; ran select num-cast(num as integer) from test_decimal;[/sql]. SEQ The list should be ordered by billing date. 2a We have a table with 3 columns: gamename | user | times_played. 7/5/2011 [sql] SQL> SELECT substr(tno,1, length(tno)-nvl(length(replace(translate(tno,’0123456789′,’0000000000′),’0′,”)),0)) a, 0 —- —- —- 0 The final solution by Mr Tom Kytes. insert into ting values(‘3a’); Join columns having duplicate values. 00a 00 7/5/2011 5:22:14 PM 7 49 5/17/2011 0 The query given below will not work. This gives the first column in the final query (A). insert into ting values(‘3′); http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:43440209618042 This is a translated summary from the original article by Alexander Chmyr. 0a (I have added rownum here to show the rows with null values.) How do you go about tuning your PL/SQL code? What is Oracle and what are its different editions? 7/5/2011 5:22:14 PM 3 21 6/14/2011 Similar to above query. [sql] SQL> SELECT tno,length(tno),nvl(length(REPLACE(translate(tno,’0123456789′,’000000000′),’0′,”)),0) FROM ting; TNO LENGTH(TNO) NVL(LENGTH(REPLACE(TRANSLATE(T WHERE seq IS NOT NULL[/sql], This is generate numbers with interval of 4. Step 4. How will you insert multiple rows of dummy data into a date column or a varchar2 column? I will try to explain the query in steps so that user will get idea of its execution. 1.2345 4 FROM ting 3 a 3a 1. ——— What is the simplest SQL Query to find the second largest value? I have three years of experience in writing automation scripts in Python and two years of experience in development and optimization of databases. 16 7.9 7 5.23333333 5 3.9 3 ( Log Out /  3a 2 1 19 9.4 9 6.23333333 6 4.65 4 —- 1) If two or more tables are joining without join condition will result into … If you want to fill an empty table with groups of data to work on analytic functions or group by functions, then you can generate “groups” of numbers by manipulating the ROWNUM column using the following query. 7/5/2011 5:22:14 PM 1 7 6/28/2011 00b b ... REGEXP_REPLACE function & SQL Query to remove Non-Numeric characters from a String. The below SQL Query will create a Unique Index on the rows having non null values: [sql] SQL> SELECT substr(tno,1, length(tno)-nvl(length(replace(translate(tno,’0123456789′,’0000000000′),’0′,”)),0)) a, ———- Step 1. 0.2345 100. Hi, In SQL*Plus, you can do a preliminary query to get the '2008' into a substitution variable (using COLUMN ... NEW_VALUE), then use that substitutiuon variable as a column alias in your main query. ———- ———- ———- ———- ———- ———- ———- Replace all the digit with 0 using translate. 0a 2. —- —- 0a a 6 ; [/sql]. 6 16 13 2 12 Answer: 3. http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:786026162431 [sql]SELECT sysdate,level-1 lv,7*(LEVEL-1) s, 1.Generate numbers/sequence using dual with a specific interval. CONNECT BY LEVEL <=100) What is VArray? —- ———– —————————— 1 4 FROM dual Get the last day of the year. Write an SQL query to find the position of the alphabet (‘a’) in the first name column ‘Amitabh’ from … 2 substr(tno,length(tno)-nvl(length(replace(translate(tno,’0123456789′,’0000000000′),’0′,”)),0) +1 ) b, What is a one-time-only procedure in pl/sql? ( Log Out /  10 b 10b insert into ting values(’31’);[/sql], TNO insert into ting values(‘2’); You have reached the maximum number of messages for today. The output [see the columns marked TWO THREE and FOUR]: [sql] R A TWO B THREE C FOUR I will not get into the details. [sql]SELECT trunc(SYSDATE-(3*(LEVEL-1))) dt FROM dual 10 b 10b 0a 1 [sql] SQL> SELECT substr(tno,1,length(tno)-nvl(length(REPLACE(translate(tno,’0123456789′,’000000000′),’0′,”)),0)) a FROM ting; Step 6. 7/5/2011 5:22:14 PM 4 28 6/7/2011 Change ), You are commenting using your Google account. BEFORE INSERT ON test_marks FOR EACH ROW 1 There are following SQL queries for Interviews, which are very important. CREATE TABLE update_using(col3 NUMBER,col4 NUMBER); Finding output of SQL Queries, Tricky SQL Queries. Another excellent solution from Mr. Tom Kytes. 6 ; A B TNO 0.099 00 3 a 3a 0 INSERT INTO test_decimal VALUES(20.0990); [sql] SQL> SELECT translate(tno,’0123456789′,’000000000′) FROM ting; TRANSLATE(TNO,’0123456789′,’00 4 In this query, we need to update col2 in to_update table with the value in col4 of update_using table. 3 INSERT INTO to_update VALUES(3,NULL); Gives 1. INSERT INTO test_decimal VALUES(1.2345); Use ANSI Joins Instead of Oracle Joins. For returning ALL when only location matches, try following query. 6 10 3 3 Complete testing / QA of the developed solution and deliver the working solution. This really hits at the core of this article. insert into ting values(‘2a’); 10a 3 1 Search for columns containing ‘%’ in Oracle. 4 11 Trying to build this query for about hour. What is Database? 1a And looked into strategies you can use to get better plans for these queries. 1 a 1a In ORACLE, you can use the ESCAPE keyword to search for strings containing ‘%’. In this How-To, we look at the most basic of these, select all the data in a table, and restricting this query by reducing the columns or rows you retrieve. VALUES (‘A1’,12,13,14);[/sql]. According to research, Oracle PL SQL has a market share of about 2.2%. 1 WHERE col4 NOT IN (SELECT col2 FROM to_update WHERE col2 IS NOT NULL), ORA-01779: cannot modify a column which maps to a non key-preserved table [/sql], “you update a join when you want the data from T1 to overwrite SQL QUERY. 6. http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:4725668677832 Only works on SQL Server 2008 and above. length(tno) -nvl(length(REPLACE(translate(tno,’0123456789′,’000000000′),’0′,”)),0) as the end index. 1 1 0 4 WHERE col4 NOT IN (SELECT col2 FROM to_update WHERE col2 IS NOT NULL) To fetch ALTERNATE records from a table. 6/26/2011 Using the escape character (to search for strings containing like ‘ABC %%TRF’, ‘TR%FF’ or ‘%GH’) 9 insert into ting values(’10b’); Step 8. 00 3 The trigger should calculate the total and update the total when we insert marks1, marks2 and marks3. [sql]NUM tricky sql queries for interview sql query questions and answers for practices, SQL Tutorial, SQL Interview Questions, SQL Tips and Tricks. 00a a [sql]CREATE TABLE to_update(col1 NUMBER,col2 NUMBER); Complex Queries in SQL ( Oracle ) These questions are the most frequently asked in interviews. The final solution is provided at the end. A very close friend given this to me. 6/11/2011 [/sql], To populate an empty table with dummy varchar2 values, we can use DBMS_RANDOM.STRING. 31 b 31b 1 substr(tno,length(tno)-nvl(length(REPLACE(translate(tno,’0123456789′,’000000000′),’0′,”)),0)+1) b FROM ting; ROWNUM B Answer. 10 10 Change ), You are commenting using your Facebook account. INSERT INTO to_update VALUES(4,11); Privilege can be given as system privilege or user privilege. 3. 00 Now, can you find 3rd, 5th or 6th i.e. WHERE col2 IS NULL[/sql]. CONNECT BY LEVEL <=100) [sql]SQL> update(SELECT a.col1,a.col2,b.col3,b.col4 FROM to_update a,update_using b insert into ting values(’11’); [sql] SQL> SELECT ROWNUM r, ROWNUM/2-0.1 a, trunc(ROWNUM/2-0.1) two, 20 20 INSERT INTO test_decimal VALUES(1.00); 5 CONNECT BY LEVEL <=20 [sql]UPDATE to_update t SET t.col2=(SELECT col4 FROM update_using I worked at Nayatel, a leading internet service provider of my country, to automate their processes using Python. If the value in col4 is already present in col2, then col2 should not be updated. baktb The query should select top three games (depending total times_played) and top three user who has … 15 7.4 7 4.9 4 3.65 3 This is a continuation of that page. Otherwise it would be considered as a META CHARACTER. Oracle tricky queries How to write a CLOB with a length > 40K out to a file? 1 COMMIT;[/sql], The table contains : Advanced SQL | Fill the Price for missing months. In Oracle SQL, there are two ways to join tables. 00 10 2 0 ——— Really tricky SQL statement I have here. The next question is on triggers. 7 3.4 3 2.23333333 2 1.65 1 Use substr to extract only the digits from tno using 1 as start index and the difference between brQiw 13. 11 00a 1 (SELECT col2 FROM to_update WHERE col2 IS NOT NULL)) 8 3.9 3 2.56666666 2 1.9 1 11 b Let insert value 1 into the table tbl_samplejoin2 so that this … SELECT * FROM (SELECT CASE WHEN MOD(LEVEL,4)=1 … 11 Otherwise, I think you need dynamic sql. 4 FROM ting; A B TNO For some reason[must be a broken tag/code], I cannot put more text into the original page Tricky SQL queries, advanced SQL queries, Interesting SQL queries. 4 WHERE col4 NOT IN (SELECT col2 FROM to_update WHERE col2 IS NOT NULL); COL1 COL2

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