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when executing Exceute Imidiate in Oracle - how many (') you need to define an inner string in the statmnent ( exp. Pls.)

Posted on 2016-07-27
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Last Modified: 2016-07-30
Hello,
when executing Exceute Imidiate in Oracle - how many (') you need to define an inner string in the statmnent ( exp. Pls.) .
note : There is 1 (') in the beginng and end of the statement
it is getting harder when inside the inner sring there  is (")
THX
Daniel
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Question by:Member_2_5866372
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Qlemo earned 250 total points
ID: 41730770
The rule is simple: Each inner single quote needs to be doubled.
' select * from tbl where id = ''one'' and description = '''' '

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This also shows how to state an empty string.
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by:awking00
awking00 earned 250 total points
ID: 41731203
The number of single quotes to use can sometimes be rather confusing. To avoid the confusion, I find it a little easier to visualize the statement using ascii values. For example, the statement " select * from stores where store_name = 'ABC' " in an execute immediate statement could be written as -
execute immediate 'select * from stores where store_name = '||chr(39)||'ABC'||chr(39);
Another step I often take is to declare a variable to hold the sql statement then print it out before using the execute immediate.
declare
v_sql varchar2(255);
begin
v_sql := 'select * from stores where store_name = '||chr(39)||'ABC'||chr(39);
dbms_output.put_line(v_sql); ==> view the sql
--execute immediate v_sql ==> comment out until the sql is what you need
end;

Then after the sql has been verified, comment out the dbms_output statement and un-comment the execute immediate statement
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Author Comment

by:Member_2_5866372
ID: 41736036
thx
awking00 and Qlemo you have explained the issue completly .
All the best
Daniel
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