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what is the meaning of "1=1" in sql statement  RSS feed

 
Nakata kokuyo
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hi, expert here , can someone pls explain what is "1=1" means in SQL statemnet , if you don't mind, kindly pls give some sample ....thank you very much for guidance
 
Manish Sridharan
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hi dear,
'1=1' are conditions used in where clause. it is taken as always true condition. Similarly statement like '1=2'or 1=3 etc means condition is false. this statement are used generally where we want to copy structure of the wxisting table but not the content of the table.
suppose we hava table emp(name,age). and it has data also.
we can fire query as
"create table emp1 as select name, age from emp where 1=2;"

Hope u have got ur answer
bye
 
Anil Kumar Saha
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This type of trick can used to hack a Database, popularly known as SQL Injection.
 
Consider Paul's rocket mass heater.
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