Comparing clob columns in two tables

I need to copy the clob data from one table to another. However, I need to remove duplicates while doing so. When I run the following query, it loads all of the rows, whether they are duplicates or not.
INSERT INTO L_COMMENTS
SELECT comments_key.NEXTVAL, 'ASSOCIATECOMMENTS', ASSOCIATECOMMENTS
FROM TABLE1 A
WHERE ASSOCIATECOMMENTS IS NOT NULL
AND NOT EXISTS
(select 1
from L_COMMENTS C
where COMMENT_TYPE = 'ASSOCIATECOMMENTS'
AND dbms_lob.compare(C.COMMENTS, A.ASSOCIATECOMMENTS) = 0)
Any idea on how to do this load? I have several similar loads to do.

If I did that, for any column that has a duplicate, neither one would be included.

Similar Messages

How can I make my query to compare only columns of two tables... not the storage information?

11GR2
=-----------------------------------
I am using below querry to compare two table that has same name, under two different users... But after making storage information false like below and if the storage information is different on column level than it create "Alter modify " statements for the column ... How can I make my query to compare only columns of two tables... not the storage information?
begin
DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM,'PRETTY', TRUE);
DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM,'SQLTERMINATOR',TRUE);
DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM,'SEGMENT_ATTRIBUTES', FALSE);
DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM,'STORAGE', FALSE);
DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM,'TABLESPACE',FALSE);
DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM,'CONSTRAINTS',FALSE);
DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM,'REF_CONSTRAINTS',FALSE);
DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM,'CONSTRAINTS_AS_ALTER',FALSE);
End;
select REGEXP_REPLACE(dbms_metadata_diff.compare_alter('TABLE','TABLE_NAME_A','TABLE_NAME_A','USER1','USER2'),('USER1...'),'', 1, 0, 'i') from dual

I am using below querry to compare two table that has same name, under two different users... But after making storage information false like below and if the storage information is different on column level than it create "Alter modify " statements for the column ... How can I make my query to compare only columns of two tables... not the storage information?
If you want help you have to SHOW us what you are doing and how you are doing it; you can't just try to tell us in your own words.
We can't see your computer screen.

Calculate total size of clob column in a table

how to Calculate total size of clob column in a table.
Thanks ,
Sakthivel

SAKTHIVEL wrote:
I would like to calculate table size and particular clob column size inside that table. The size of the table and the size of the LOB are two totally different things.
Barring cases where the LOB is less than 4k and stored inline, the LOB data is stored outside the table in a separate segment.
If you want to get the combined size of the table and of its LOB segments, you could do something like
SELECT SUM(bytes)/1024/1024 gb
FROM dba_segments
WHERE (owner = <<table owner>> and
       segment_name = <<table name>>)
    OR (owner, segment_name) IN (
        SELECT owner, segment_name
          FROM dba_lobs
         WHERE owner = <<table owner>>
            AND table_name = <<table name>> )Justin

How to update two columns in two tables?

hi friends
I have two tables linked to each other through SaleNo and SaleDT. their structure as below
Sales Table============
SaleNo int PK auto increment
SaleDT Datetime PK
Qnty decimal
Units decimal
Invoices table
=================InvoiceNo int PK Auto incremented
InvoiceDT Datetime
SaleNo int FK
SaleDT Datetime FK
Note that SaleDT column is NOT assigned with getDate() expression.
1. what I need to do is update the SaleDT column of Sales table and Invoices table with the value '2013-01-31 10:31:55.813', how do I do this without manually breaking the link between the tables?
2. Assume SaleNos 15 to 27 needs update the SaleDT to '2013-06-12 10:31:55.813', how do I do this complex operation where I I have update SaleDt column of two table of SaleNo range from 15 to 27?
thanks
I use Visual studio 2012 Ultimate and SQL server 2008 developer edition!

Why not below? May be you will not be able to change your design now, but just want to share.
Sales Table============
SALEID int PK autoincrement
SaleNo int
SaleDT Datetime
Qnty decimal
Units decimalUNIQUE (Saleno,SaleDT)
Invoices table
=================InvoiceNo int PK Auto incremented
InvoiceDT Datetime
SALEID int FK

Selecting columns from two table is slow but same

I am selecting 27 columns from two tables
which running for more than 30 minutes. but
if I select count(*) with the same query
except the columns it is coming in seconds.
Where is the error?

If you post
1) The table definitions for the underlying tables
2) The indexes that are on the tables
3) The two SQL statements you're running
4) The explain plan for both statements
we can probably be of some assistance.
My guess is that the count(*) is able to return much more quickly because the optimizer is able to use a significantly faster query plan that is based on an index which the longer-running query cannot utilize. Without the information I've requested, though, it's hard to do more than speculate.
Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC

How to Find Two Matching Columns in Two Table(to create a JOIN)

Hi Guys!
I just wondering if it is possible to have a SQL query to find two matches columns in two table to create any type of joins?!
Let's say I have two tables CUSTOMER + INVOICE is it possible to run a SQL query to find two join able columns without scanning the tables visually?!
Best Regards,

Well, there's the Data Dictionary you could query for foreign key columns/constraints.
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:661009003696

Compare two columns between two tables

Hi all,
I have two separate datasets in Table 1 and Table 2.
Both datasets have Column A First name and Column B Last name in common.
The data in the subsequent columns is different.
Some of the people listed in each table are the same.
I want to delete the people from Table 1 who are in table 2.
If I run a formula like this =COUNTIF(Table 1 :: A2:A200, A2) I can return a 1 or 0, use conditional formatting to colour that cell, sort the table and delete all the rows containing 1.
However that only checks for First Name.
What I need to do is check if First name AND Last name in Table 1 are the same as First Name AND Last Name in Table 2 - and then return a True of False (1 or 0 or anything) in a separate column.
Please help.
Thanks in advance.
M.

Moich wrote:
Presumably this lets me compare multiple values across multiple tables also?
Moich,
As you will see as you become familiar with this function, it can only count rows in one table. The comparison (criteria) values can come from anywhere, but what you are counting are "records" that meet the multiple criteria. A record is one row. I think that was your question, but I'm not positive.
I can't seem to find how to insert formulas into the conditional rules.
You'll have to put the formulas elsewhere and refer to them with simple comparisons.
Jerry

Query for comparing two columns in two tables

Hai, all,
I have following two tables and columns, I need to get the rows (all columns) from scott.cp_ip which are not ( the same value present in t1 and also in t2).
Table scott.cp_ip column cp_ip.vrno = Table scott.cb1 column cb1.cb_vnno
I used the following query and did not get the correct result:
select * from scott.cp_ip where cp_ip.vrno in (select cb1.cb_vnno from scott.cb1);
Can you please tell how it can be solved?
Thanks in advance.
Rcs
SQL> desc scott.cb1;
Name Null? Type
ID NUMBER
SUPCODE NUMBER
SUPLNAME VARCHAR2(100)
NAME VARCHAR2(100)
ITEMCODE VARCHAR2(10)
RECDOC NUMBER
RECDATE VARCHAR2(10)
TOTVALUE NUMBER
QTY NUMBER
CB_IPNO NUMBER
CB_VNNO NUMBER
CB_VDT VARCHAR2(10)
CB_AMT NUMBER
SQL> desc scott.cp_ip;
Name Null? Type
ID NUMBER
VRNO NUMBER
CODE VARCHAR2(50)
HEAD VARCHAR2(255)
PARTI VARCHAR2(255)
CR NUMBER
SQL> select * from scott.cp_ip
2 intersect
3 select * from scott.cb1;
select * from scott.cp_ip
ERROR at line 1:
ORA-01789: query block has incorrect number of result columns
SQL> (select * from scott.cp_ip
2 minus
3 select * from scott.cb1)
4 union all
5 (select * from scott.cb1
6 minus
7 select * from scott.cp_ip);
(select * from scott.cb1
ERROR at line 5:
ORA-01789: query block has incorrect number of result columns
SQL> select * from scott.cp_ip where cp_ip.vrno in (select cb1.cb_vnno from scott.cb1);
result=instead of 1408 rows, 1481 rows (excess 73 rows) getting!
----------

Instead of SELECT * write only the column that you want to compare. I guess that would be cb1.cb_vnno and cp_ip.vrno.

How to compare the names and types columns of two tables?

Assume I have two tables aaa and bbb
How do I compare the columnnames and types of the two columns?
It should not matter if one of them has e.g. an additional index.
Furthermore it does not matter if the rows/row values differ.
Peter

SQL> desc emp
Nome                   Nullo?   Tipo
EMPNO                  NOT NULL NUMBER(4)
ENAME                           VARCHAR2(10)
JOB                             VARCHAR2(9)
MGR                             NUMBER(4)
HIREDATE                        DATE
SAL                             NUMBER(7,2)
COMM                            NUMBER(7,2)
DEPTNO                          NUMBER(2)
SQL> desc emp2
Nome                   Nullo?   Tipo
EMPNO                  NOT NULL NUMBER(4)
ENAME                           VARCHAR2(10)
MGR                             VARCHAR2(10)
HIREDATE                        DATE
SAL                             NUMBER(7,2)
COMM                            NUMBER(7,2)
DEPTNO                          NUMBER(2)
NEWCOL                          NUMBER
SQL> with t1 as
2 (select column_name, data_type from user_tab_columns where table_name='EMP'),
3 t2 as
4 (select column_name, data_type from user_tab_columns where table_name='EMP2')
5 Select a.column_name, a.data_type, b.column_name, b.data_type
6 from t1 a full outer join t2 b on a.column_name=b.column_name;
COLUMN_NAME                    DATA_TYPE                      COLUMN_NAME                    DATA_TYPE
EMPNO                          NUMBER                         EMPNO                          NUMBER
ENAME                          VARCHAR2                       ENAME                          VARCHAR2
                                                              NEWCOL                         NUMBER
MGR                            NUMBER                         MGR                            VARCHAR2
HIREDATE                       DATE                           HIREDATE                       DATE
SAL                            NUMBER                         SAL                            NUMBER
COMM                           NUMBER                         COMM                           NUMBER
DEPTNO                         NUMBER                         DEPTNO                         NUMBER
JOB                            VARCHAR2
Selezionate 9 righe.Max
http://oracleitalia.wordpress.com
Edited by: Massimo Ruocchio on Feb 21, 2010 1:27 AM
Changed query.

Comparing two columns in two tables using partial text strings and copying data between tables

I have two tables:
The Vendor table is supplied by a clothing manufacturer and lists product data by row with a column that contains a unique manufacturer ID, such as T5C4. In this table is a short product description and a long product description that I need to find and copy into the second table, Inventory.
The Inventory table is an export from our Magento store. Each row contains a unique inventory number in a column that includes but does not match the unique manufacturer ID from the Vendor table. For example, the unique inventory number could be T5C4-W12, or RED-T5C4W12 or some other variation.
For each product in Inventory, I need to find the matching product in Vendor, and then copy the short description and long description from Vendor to Inventory.
Any tips? Thanks!
Karl

Karl,
Here's a start, as you requested.
The formula for Our Inventory Row is:
=IFERROR(MATCH("*"&A&"*", Our Inventory :: A, 0), "n/a")
The formula for Brief Description in the inventory table is:
=IFERROR(INDEX(ABC Products :: $A$1:$C$9,MATCH(ROW(), ABC Products :: $D, 0), 2), "n/a")
The formula for the Full description in the inventory table is:
=IFERROR(INDEX(ABC Products :: $A$1:$C$9,MATCH(ROW(), ABC Products :: $D, 0), 3), "n/a")
The Manufacturer's table knows the concise product numbers, so it has the ability to search the Inventory table for it's product id's using wildcards and it then displays the line number of the item in the inventory table. The Inventory table can then search the manufacturer's table for its row number and can reference the brief and full descriptions.
This approach has a serious limitation. It will only find the first occurrence in the inventory. Now, if you want to accept this, you can sort all the found descriptions and pull them out of the inventory table, and then the next product in line will display it's description too.
I wish I could do better with this, but it's all I can come up with at this point, knowing only what you have told me.
Jerry

Compare two columns in two tables

Hi All,
I have two tables have no relations, but one have first_name, last_name and address in text fields,
table B has name , address but i need to search in the field to find the match.
EX: Table A
first_name: LLoyd
last_name: Fernanda
address: 123 cololbl av
Table B
name: peter lloyed Fernanda
address: 123 cololbl av E florida
this is like i have name and address, you get in a another table names and address not formatted well, i need to find the matches at lest 80 to 90%
Thx
Harsha

Unfortunately you did not mention your db version.
I think from 10g on you can use UTL_MATCH as e.g. in:
SQL> with a as (
select 'LLoyd' first_name, 'Fernanda' last_name, '123 cololbl av' address from dual
, b as (
select 'peter lloyed Fernanda' name, '123 cololbl av E florida' address from dual
select *
from a, b
where utl_match.jaro_winkler_similarity (
                first_name || last_name,
                name
           ) > 50
     and utl_match.jaro_winkler_similarity (
                a.address,
                b.address
           ) > 90
FIRST_NAME LAST_NAME ADDRESS        NAME                  ADDRESS_1
LLoyd      Fernanda 123 cololbl av peter lloyed Fernanda 123 cololbl av E florida
1 row selected.

How to read/write .CSV file into CLOB column in a table of Oracle 10g

I have a requirement which is nothing but a table has two column
create table emp_data (empid number, report clob)
Here REPORT column is CLOB data type which used to load the data from the .csv file.
The requirement here is
1) How to load data from .CSV file into CLOB column along with empid using DBMS_lob utility
2) How to read report columns which should return all the columns present in the .CSV file (dynamically because every csv file may have different number of columns) along with the primariy key empid).
eg: empid report_field1 report_field2
1 x y
Any help would be appreciated.

If I understand you right, you want each row in your table to contain an emp_id and the complete text of a multi-record .csv file.
It's not clear how you relate emp_id to the appropriate file to be read. Is the emp_id stored in the csv file?
To read the file, you can use functions from [UTL_FILE|http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14258/u_file.htm#BABGGEDF] (as long as the file is in a directory accessible to the Oracle server):
declare
    lt_report_clob CLOB;
    l_max_line_length integer := 1024;   -- set as high as the longest line in your file
    l_infile UTL_FILE.file_type;
    l_buffer varchar2(1024);
    l_emp_id report_table.emp_id%type := 123; -- not clear where emp_id comes from
    l_filename varchar2(200) := 'my_file_name.csv';   -- get this from somewhere
begin
   -- open the file; we assume an Oracle directory has already been created
    l_infile := utl_file.fopen('CSV_DIRECTORY', l_filename, 'r', l_max_line_length);
    -- initialise the empty clob
    dbms_lob.createtemporary(lt_report_clob, TRUE, DBMS_LOB.session);
    loop
      begin
         utl_file.get_line(l_infile, l_buffer);
         dbms_lob.append(lt_report_clob, l_buffer);
      exception
         when no_data_found then
             exit;
      end;
    end loop;
    insert into report_table (emp_id, report)
    values (l_emp_id, lt_report_clob);
    -- free the temporary lob
    dbms_lob.freetemporary(lt_report_clob);
   -- close the file
   UTL_FILE.fclose(l_infile);
end;This simple line-by-line approach is easy to understand, and gives you an opportunity (if you want) to take each line in the file and transform it (for example, you could transform it into a nested table, or into XML). However it can be rather slow if there are many records in the csv file - the lob_append operation is not particularly efficient. I was able to improve the efficiency by caching the lines in a VARCHAR2 up to a maximum cache size, and only then appending to the LOB - see [three posts on my blog|http://preferisco.blogspot.com/search/label/lob].
There is at least one other possibility:
- you could use [DBMS_LOB.loadclobfromfile|http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14258/d_lob.htm#i998978]. I've not tried this before myself, but I think the procedure is described [here in the 9i docs|http://download.oracle.com/docs/cd/B10501_01/appdev.920/a96591/adl12bfl.htm#879711]. This is likely to be faster than UTL_FILE (because it is all happening in the underlying DBMS_LOB package, possibly in a native way).
That's all for now. I haven't yet answered your question on how to report data back out of the CLOB. I would like to know how you associate employees with files; what happens if there is > 1 file per employee, etc.
HTH
Regards Nigel
Edited by: nthomas on Mar 2, 2009 11:22 AM - don't forget to fclose the file...

How to retreive soap xml data from clob column in a table

Hi,
I am trying to retrieve the XML tag value from clob column.
Table name = xyz and column= abc (clob datatype)
data stored in abc column is as below
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:head="http://www.abc.com/gcgi/shared/system/header" xmlns:v6="http://www.abc.com/gcgi/services/v6_0_0_0" xmlns:sys="http://www.abc.com/gcgi/shared/system/systemtypes">
<soapenv:Header xmlns:wsa="http://www.w3.org/2005/08/addressing">
<RqHeader soapenv:mustUnderstand="0" xmlns="http://www.abc.com/gcgi/shared/system/header">
<DateAndTimeStamp>2011-12-20T16:02:36.677+08:00</DateAndTimeStamp>
<UUID>1000002932</UUID>
<Version>6_0_0_0</Version>
<ClientDetails>
<Org>ABC</Org>
<OrgUnit>ABC</OrgUnit>
<ChannelID>HBK</ChannelID>
<TerminalID>0000</TerminalID>
<SrcCountryCode>SG</SrcCountryCode>
<DestCountryCode>SG</DestCountryCode>
<UserGroup>HBK</UserGroup>
</ClientDetails>
</RqHeader>
<wsa:Action>/SvcImpl/bank/
SOAPEndpoint/AlertsService.serviceagent/OpEndpointHTTP/AlertDeleteInq</wsa:Action></soapenv:Header>
<soapenv:Body>
<v6:AlertDeleteInqRq>
<v6:Base>
<v6:VID>20071209013112</v6:VID>

<v6:Ref>CTAA00000002644</v6:Ref>
</v6:Base>
</v6:AlertDeleteInqRq>
</soapenv:Body>
</soapenv:Envelope>
And i want to retrieve the values of tag
<ChannelID> and <v6:VID>
can somebody help, i have tried with extractvalue but not able to get the values

I have used the below two queries but not able to get the expected results. Both queries result into no values.
select xmltype(MED_REQ_PAYLOAD).extract('//ClientDetails/Org','xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" || xmlns="http://www.abc.com/gcgi/shared/system/header"').getStringValue() from ESB_OUTPUT_TEMP where SOAPACTION = '/SvcImpl/bank/alerts/v6_0_0_0/SOAPEndpoint/AlertsService.serviceagent/OpEndpointHTTP/AlertDeleteInq'
select EXTRACTVALUE(xmltype(MED_REQ_PAYLOAD),'/RqHeader/) from ESB_OUTPUT_TEMP where SOAPACTION = '/SvcImpl/bank/SOAPEndpoint/AlertsService.serviceagent/OpEndpointHTTP/AlertDeleteInq'
Well, for starters, both queries are syntactically wrong :
- non terminated string
- incorrect namespace mapping declaration
- unknown XMLType method "getStringValue()"
Secondly, all those functions are deprecated now.
Here's an up-to-date example using XMLTable. It will retrieve the two tag values you mentioned :
SQL> select x.*
2 from esb_output_temp t
3     , xmltable(
4         xmlnamespaces(
5           'http://schemas.xmlsoap.org/soap/envelope/' as "soap"
6         , 'http://www.abc.com/gcgi/shared/system/header' as "head"
7         , 'http://www.abc.com/gcgi/services/v6_0_0_0' as "v6"
8         )
9       , '/soap:Envelope'
10         passing xmlparse(document t.med_req_payload)
11         columns ChannelID varchar2(10) path 'soap:Header/head:RqHeader/head:ClientDetails/head:ChannelID'
12               , VID        varchar2(30) path 'soap:Body/v6:AlertDeleteInqRq/v6:Base/v6:VID'
13       ) x
14 ;
CHANNELID VID
HBK        20071209013112
You may also want to store XML in XMLType columns for both performance and storage optimizations.

To check whether there is any format mismatch between columns of two tables

Hi,
I have got a table 'T' (Source table) with columns
T_Lat Varchar2(50);
T_Amt Varchar2(50);
T_Cat Varchar2(50);
(all these above columns have numeric data)
Actually, Here I have taken only the columns having numeric data from table 'T'
Now I have another table 'M'(Destination Table) with columns
M_Lat number;
M_AMt number;
M_Cat number;
Now my task is I have to do a prevalidation of the data in 'T' that whether all the data in those columns will suit for the destination table columns respectively (to check whether there is any format mismatch). This check should be done dynamically(as there are more than 50 columns in real).
Note:- There is no unique mapping column for these two tables
I think it can be done using arrays or plsql tables. But i dont have idea using them.
Can any one help me in this regard.

Why, What's wrong with these post and there responce?
{message:id=10480898}
{message:id=10472737}

To check whether there is any size mismatch between columns of two tables

Hi,
Here i got two tables T and M where i am going to migrate data from T to M. But before migrating i need to check whether all the data in source table fits into destination table columns. The datatypes of all columns in source table T is of Varchar2 only as it is a temp table.
Ex :- Table 'T' (Source table) with columns
T_Lat Varchar2(50);
T_Amt Varchar2(50);
T_Cat Varchar2(50);
T_Vat Varchar2(50);
Now I have another table 'M'(Destination Table) with columns
M_Lat Varchar2(50);
M_Amt varchar2(25);
M_Cat date;
M_Vat number;
Now my task is I have to do a prevalidation of the data in 'T' that whether all the data in those columns will suit for the destination table columns respectively (to check whether there is any size mismatch). This check should be done dynamically.
For suppose, in T_Amt(source column of T table) if text is abt 50 characters, it cant fit M_Amt(destination column of M table). In this case it should throw an error indicating that destination column size is less for the source column.
Note:- There is no unique mapping column for these two tables and there are about 400 columns in the source table to be validate
I think it can be done using arrays or plsql tables.
Can any one help in this regard.

>
Now my task is I have to do a prevalidation of the data in 'T' that whether all the data in those columns will suit for the destination table columns respectively (to check whether there is any size mismatch). This check should be done dynamically.
>
Just because the source table T_Amt column is defined as 50 doesn't mean any of the data is really that long. So the data itself needs to be checked. That is just what a simple query can do.
See my answer in this thread Posted: Jul 25, 2012 1:14 PM
Re: Help in Execute Immediate - Invalid relational Operator
Here is the modified sample query and results for a query of a clone of the EMP table with some modified data
select count(*) cnt,
       -- job column
       sum(case when job is null then 1 else 0 end) job_nul,
       sum(case when job = 'SALESMAN' then 1 else 0 end) job_salesman,
       min(length(job)) job_minlength, max(length(job)) job_maxlength,
       min(job) job_min, max(job) job_max,
       -- hiredate colulmn
       sum(case when hiredate is null then 1 else 0 end) hiredate_nul,
       min(hiredate) hiredate_min,
       max(hiredate) hiredate_max
        from emp1
CNT JOB_NUL JOB_SALESMAN JOB_MINLENGTH JOB_MAXLENGTH JOB_MIN JOB_MAX HIREDATE_NUL HIREDATE_MIN HIREDATE_MAX
14    2       4            5             9             ANALYST SALESMAN 0            9/28/0001    12/3/9999With one query and ONE pass thru the table I was able to get the COUNTs, the MIN and MAX values for each column and the MIN and MAX lengths of the VARCHAR2 columns.
There are 14 total records, 2 where JOB is null, 4 where the JOB is SALESMAN. The MIN length of the JOB data is 5 and the MAX is 9.
Look at the date values. The results tell me I have some problem data.
The length data tells me if I try to put the JOB data into another table I need to define the length as at least 9 or it won't fit.
For your use case you might find that all of the data in the T_Lat column is shorter than 26 and will actually fit into the M_Lat target table column.

Comparing clob columns in two tables

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