26. What is a constraint? Constraint can be used to specify the limit on the data type of table. Constraint can be specified while creating or altering the table statement. Sample of constraint are. NOT NULL. CHECK. DEFAULT. UNIQUE. PRIMARY KEY. FOREIGN KEY. 32. What is Cross-Join? Cro...
Doing an SQL interview as part of your job application?Get some advance practice with our free sample questions.SQL, a programming language used to communicate with databases, is one of the most useful skills to know for recruiting in the tech industry. Pronounced "ess-cue-ell" and short ...
Prepare for your SQL interview with these top SQL joins interview questions and answers. Get ready to ace your interview and showcase knowledge of SQL joins.
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INSERT SAMPLE1 DEFAULT VALUESSELECT @@IDENTITY -- It returns value 100 this was inserted by triggerSELECT SCOPE_IDENTITY() -- It returns value 1 this was inserted by insert query in SAMPLE1SELECT IDENT_CURRENT('SAMPLE2') -- It returns value inserted in SAMPLE2 table...
We can use a DMV called “sys.DM_OS_Memory_Clerks”. Sample query to calculate total AWE memory allocated is “SELECT SUM(awe_allocated_kb) FROM sys.dm_os_memory_clerks” From 2008 onwards we can get all memory related information using DMV “sys.dm_os_process_memory”. ...
10.What is mean by Unique Indexes?(90% asked PL SQL Interview Questions) Answer: 1.To create unique index you must have CREATE ANY INDEX privilege.Here the concept is bit different.User needs to check the values of the table to create unique index.If table contains uniquely identified value...
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1、查询“001”课程比“002”课程成绩高的所有学生的学号; selecta.S#from(selects#,scorefromSCwhereC#='001') a,(selects#,score fromSCwhereC#='002') b wherea.score>b.scoreanda.s#=b.s#; 2、查询平均成绩大于60分的同学的学号和平均成绩; ...
Create a sample table: 1 2 3 4 5 6 7 CREATE TABLE tbl_Students ( StudID INT IDENTITY(1,1) ,Name VARCHAR(10) ,CONSTRAINT pk_tbl_Students_StudID PRIMARY KEY(StudID) ) GO Create a NonClustered index on Name column: 1 2 CREATE NONCLUSTERED INDEX idx_tbl_Students_Name ...