sql - Issue with dynamic execute immediate query -

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i have code in procedure looks this. when execute code, error mentioned below.

the error report got is:

error report - ora-06553: pls-306: wrong number or types of arguments in call 'ogc_y' ora-06512: @ line 20 06553. 00000 - "pls-%s: %s" *cause:
*action:

the error has primary_flag = "y" <-- this. how else can write primary_flag = 'y' inside string? dynamic query required in case.

my code is:

    declare      p_assignee_id number := 10153;      time_stamp timestamp := '12-dec-2011';      create_task_view_sql varchar2(4000);      begin         create_task_view_sql:=                                          'select unique cp.sub_last_name                                            cs_sr_contact_points_v cp                                            cp.incident_id = 55500                                            , cp.contact_phone not null                                            , primary_flag = "y"';         dbms_output.put_line(create_task_view_sql);         execute immediate create_task_view_sql;   end;

to embed quoted string in quoted string, use 2 single quotes:

'...and primary_flag=''y''';

or can use newer q' syntax avoid doubling embedded quotes:

q'[...and primary_flag='y']';

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