Dynamic SQL question. What are these apostrophes for?

Here is a solution provided by Boneist in the two questions relating to a so-called simple dynamic SQL thread

declare
v_rs date;

begin
for i in (select table_name from user_tables)
     loop
     execute immediate 'select last_analyzed from user_tables where table_name = ''' || i.table_name||''''  into v_rs;
     dbms_output.put_line(i.table_name ||'----'||v_rs);
end loop;
end;

When a tablename is extracted, it should be in single quotes as "DEPT". My question is about the quotes surrounding i.table_name (three quotes on the left) and 4 quotes on the right of the concatenation

''' || i.table_name||''''

First quote on the left is the final quote from SELECT (' select last_analyzed)

Second quote from left to right - I think this is the quote from beginning to the name of the table ("DEPT)

Quote from third starting on the left -?

I have not understant what 4 quotes on the right of the concatenation of c. I know one of them is the quotation from the end (right) for the name of the table (like DEPT')

JOE_humble wrote:
When a tablename is extracted, it should be in single quotes as "DEPT". My question is about the quotes surrounding i.table_name (three quotes on the left) and 4 quotes on the right of the concatenation

Actually 4 quotes on the left quotation marks and 4 right...

execute immediate 'select last_analyzed from user_tables where table_name = ''' || i.table_name||''''  into v_rs;
                  ^                                                         ^^^                  ^^^^
                  |                                                         |||                  ||||
                   \________________________________________________________///                  \||/
                                              |                                                   \|
                                            4 quotes                                            4 quotes

Maybe better if you look at it like this...

Suppose we use a character # to indicate the beginning and the end of our strings...

execute immediate #select last_analyzed from user_tables where table_name = ''# || i.table_name||#''#  into v_rs;

Now, you can see that we have two strings concatenated with the variable string representing the table name concatenated together.

Within each of these channels, we have two single quotes. When the parser crosses the two single quotes like this, in the string, which converts a quotation mark in the resulting string, rather than taking this means the end of the string itself.

Tags: Database

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