Single quotes in strings – oracle SQL query

Apostrophe/single quote in a concatenated string

If you were to concatenate an apostrophe/single quote in a string, you need to enter 4 single quotes for Oracle to display a quote symbol. For example:

SELECT 'Today' || '''' || 's Date: ' || sysdate FROM dual;

Today’s Date: 09-DEC-20

select 'PDB Name is : ' || name || ':' from v$pdbs;

PDB Name is : ABC:

SELECT 'Hello' || '''' || 's World' FROM dual;

Hello’s World

Apostrophe/single quote at start of string

When the apostrophe/single quote is at the start of the string, you need to enter 3 single quotes for Oracle to display a quote symbol. For example:

SELECT '''Hello World' FROM dual;

would return

'Hello World

Apostrophe/single quote in the middle of a string

When the apostrophe/single quote is in the middle of the string, you need to enter 2 single quotes for Oracle to display a quote symbol. For example:

SELECT 'She''s Here' FROM dual;

would return

She's Here

Apostrophe/single quote at the end of a string

When the apostrophe/single quote is at the end of a string, you need to enter 3 single quotes for Oracle to display a quote symbol. For example:

SELECT 'Worlds''' FROM dual;

would return

Worlds'