Doubt in like operator

hi,
select name from emp where name like'%a'
select name from emp where name like'a%'
select name from emp where name like'%a%'
above the three statements what is the difference between putting % front,back,both.
plese can anyone clarify my doubts

Consider the below example:
Table emp
Column : name
manoj
ashutosh
aniket
kanya
1. select name from emp where name like'%a' will give output as Kanya
2. select name from emp where name like'a%' will give output as ashutosh and aniket
3. select name from emp where name like'%a%' will give ouptut as manoj, ashutosh, aniket and kanya . As the third statement says where a matches in the string followed by Zero, one or more character same applies to string succeeded by by Zero, one or more.
I hope this makes sense.
~Vinod

Similar Messages

Doubt in LIKE.

Hi,
I have a doubt in like operator.
i have created a table and inserted few records by using the following sql statements.
CREATE TABLE james_sample1 (a VARCHAR2(20));
INSERT INTO james_sample1 VALUES(12);
INSERT INTO james_sample1 VALUES(123);
INSERT INTO james_sample1 VALUES(1234);
INSERT INTO james_sample1 VALUES(12345);
INSERT INTO james_sample1 VALUES(123456);
and i try the following query,
SELECT * FROM james_sample1 WHERE a LIKE '%_%';
and the above query returns all the records. but none of the columns has '_' in it.
can any body tell me why it behaves like this?
Thanks,
James

Hi James,
By SQL, the character '_' underscore with 'LIKE' means "any character, specific length" (as in the opposite of %, which means "any character, no specific length").
So, what you were asking is: give me the values that consist of any character of no specific length, followed by any character which is exactly 1 position long and then followed by any character(s) again. No wonder that all values come up...
Usually, you would use _ like this: where view_name like 'myview_'1, which would give back myviewA1, myviewB1, etc. But not myviewCCC1
Sometimes, the _ can be a problem, for example when you want all views with a name that begins with TEST_, but not TEST1. Then, use substr(view_name,1,3) = 'TEST_', because _ only works like a wildcard with like.
Regards,
Sabine
Regards,
Sabine

Alternate query to LIKE operator

I have table with contains 65 lakes records, I need to delete the records which does not contains space in column values
Ex : table
Code test_num
NL 123 AP
NL 567ZP
NL 427 SL
NL 456IP
I had return the query like these Delete table A where test_num is not like ‘% %”;
But the problem is the query is getting hang. Because of I am using like operator
Please let me know is there is any alternate query to write
If there any PLSQL to write fetch the query 1laksh records and then delete the records
Deleted rows count is 20Lak

user13711017 wrote:
I had return the query like these Delete table A where test_num is not like ‘% %”;
But the problem is the query is getting hang. Because of I am using like operator
What makes you think so?
It could "hang" (you probably mean "take a long time") due to many other reasons:
- Your system is busy with other stuff and your process gets only partial system resources;
- There is a delete (row) trigger on that table that takes a lot of time;
- The table has many indexes, whose maintenance takes a lot of time;
I doubt it is "because of you using like operator"...

Can I use a LIKE operator in an IF statement in a column formula

This is what I have so far.
CASE WHEN Opportunity."Sales Type" LIKE '*New Acct' THEN 'Sale to NEW Customer' END
I want to display 'Sale to NEW Customer' if opportunity type contains the terms New Acct.

Try this:
CASE WHEN Opportunity."Sales Type" LIKE '%New Acct' THEN 'Sale to NEW Customer' END
The LIKE operator requires a % wildcard rather than the * wildcard.
Mike L.

Why the 'LIKE' operator takes so much time to run?

I have a table T with 3 columns and 3 indexes:
CREATE TABLE T
id VARCHAR2(38) NOT NULL,
fid VARCHAR2(38) NOT NULL,
val NVARCHAR2(2000) NOT NULL
ALTER TABLE T ADD (CONSTRAINT pk_t PRIMARY KEY (id,fid));
CREATE INDEX t_fid ON T(fid);
CREATE INDEX t_val ON T(val);
Then I have the following two queries which differ in only one place - the 1st one uses the '=' operator whereas the 2nd uses 'LIKE'. Both queries have the identical execution plan and return one identical row. However, the 1st query takes almost 0 second to execute, and the 2nd one takes more than 12 seconds, on a pretty beefy machine. I had played with the target text, like placing '%' here and/or there, and observed the similar timing every time.
So I am wondering what I should change to make the 'LIKE' operator run as fast as the '=' operator. I know CONTEXT/CATALOG index is a viable approach, but I am just trying to find out if there is a simpler alternative, such as a better use of the index t_val.
1) Query with '=' operator
SELECT id
FROM T
WHERE fid = '{999AE6E4-1ED9-459B-9BB0-45C913668C8C}'
AND val = '3504038055275883124';
2) Query with 'LIKE' operator
SELECT id
FROM T
WHERE fid = '{999AE6E4-1ED9-459B-9BB0-45C913668C8C}'
AND val LIKE '3504038055275883124';
Execution Plan
0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=1 Card=1 Bytes=99)
1 0 TABLE ACCESS (BY INDEX ROWID) OF 'T' (Cost=1 Card=1 Bytes=99)
2 1 INDEX (RANGE SCAN) OF 'T_VAL' (NON-UNIQUE) (Cost=4 Card=12)

I will for sure try to change the order of the PK and see whether there will be any impact to the performance.
In our application, val is much closer to a unique value than fid. In the example query, the execution plan showed that the index on val was indeed used in the execution of the query. That's why the 1st query took almost no time to return (our table T has more than 6 million rows).
I was hoping the 'LIKE' operator would utilize the t_val index effectively and provide similar performance to the '=' operator. But apparently that's not the case, or needs some tricks.

[Microsoft][SQL Server Native Client 11.0][SQL Server]The text, ntext, and image data types cannot be compared or sorted, except when using IS NULL or LIKE operator. 'Items' (OITM) (OITM)

Dear Experts,
i am getting the below error when i was giving * (Star) to view all the items in DB
[Microsoft][SQL Server Native Client 11.0][SQL Server]The text, ntext, and image data types cannot be compared or sorted, except when using IS NULL or LIKE operator. 'Items' (OITM) (OITM)
As i was searching individually it is working fine
can any one help me how to find this..
Regards,
Meghanath.S

Dear Nithi Anandham,
i am not having any query while finding all the items in item master data i am giving find mode and in item code i was trying to type *(Star) and enter while typing enter the above issue i was facing..
Regards,
Meghanath

Error in SQL Query The text, ntext, and image data types cannot be compared or sorted, except when using IS NULL or LIKE operator. for the query

hi Experts,
while running SQL Query i am getting an error as
The text, ntext, and image data types cannot be compared or sorted, except when using IS NULL or LIKE operator. for the query
select T1. Dscription,T1.docEntry,T1.Quantity,T1.Price ,
T2.LineText
from OQUT T0 INNER JOIN QUT1 T1 ON T0.DocEntry = T1.DocEntry INNER JOIN
QUT10 T2 ON T1.DocEntry = T2.DocEntry where T1.DocEntry='590'
group by T1. Dscription,T1.docEntry,T1.Quantity,T1.Price
,T2.LineText
how to resolve the issue

Dear Meghanath,
Please use the following query, Hope your purpose will serve.
select T1. Dscription,T1.docEntry,T1.Quantity,T1.Price ,
CAST(T2.LineText as nvarchar (MAX))[LineText]
from OQUT T0 INNER JOIN QUT1 T1 ON T0.DocEntry = T1.DocEntry LEFT OUTER JOIN
QUT10 T2 ON T1.DocEntry = T2.DocEntry --where T1.DocEntry='590'
group by T1. Dscription,T1.docEntry,T1.Quantity,T1.Price
,CAST(T2.LineText as nvarchar (MAX))
Regards,
Amit

Like operator functionality

We have a simple select query which is using the 'Like' operator on a char(4) column.
In a oracle windows environment when we have a query such as:
select col1, col2, col3
from table1
where col1 like 'AB'
it returns everything which is = to 'AB' and doesn't seem to be including the trailing 2 spaces as would be stored becasue the column is char(4)
In a oracle unix environment when we the same query:
select col1, col2, col3
from table1
where col1 like 'AB'
it returns nothing...
It appears as if the version running on a windows environment is truncating the trailing 2 spaces when using the like expression but in a unix environment, it is not. Does anybody have any idea or clue what could be occuring or if there is some database setting which could cause this to occur?

Quote from Oracle Doc:
Character Values
Character values are compared using one of these comparison rules:
Blank-padded comparison semantics
Nonpadded comparison semantics
The following sections explain these comparison semantics.
Blank-Padded Comparison Semantics If the two values have different lengths, then Oracle first adds blanks to the end of the shorter one so their lengths are equal. Oracle then compares the values character by character up to the first character that differs. The value with the greater character in the first differing position is considered greater. If two values have no differing characters, then they are considered equal. This rule means that two values are equal if they differ only in the number of trailing blanks. Oracle uses blank-padded comparison semantics only when both values in the comparison are either expressions of datatype CHAR, NCHAR, text literals, or values returned by the USER function.
Nonpadded Comparison Semantics Oracle compares two values character by character up to the first character that differs. The value with the greater character in that position is considered greater. If two values of different length are identical up to the end of the shorter one, then the longer value is considered greater. If two values of equal length have no differing characters, then the values are considered equal. Oracle uses nonpadded comparison semantics whenever one or both values in the comparison have the datatype VARCHAR2 or NVARCHAR2.
"

Using Like Operator in a decode function

Hi,
I am trying to find out if I can use the like operator in a decode function
like:
select decode(1234,like '%123%','123 is a match') from dual;
this reults in error ORA-00936: missing expression
is there any way to make this work?
thank you

SQL> ed
Wrote file afiedt.buf
1 WITH tbl AS (SELECT '201aaa' dt FROM DUAL UNION ALL
2               SELECT '123bbb' dt FROM DUAL UNION ALL
3               SELECT '567ccc' dt FROM DUAL UNION ALL
4               SELECT 'ab123ddd' dt FROM DUAL
5               )
6 SELECT dt,CASE WHEN dt like '%123%' THEN 'Match'
7         ELSE 'Not Matched'
8         END With_case
9        ,DECODE(REGEXP_SUBSTR(dt,'123'),NULL,'Not Match','Match')   With_Regexp
10        ,DECODE(INSTR(dt,'123'),0,'Not Match','Match') With_Instr
11        ,DECODE(REPLACE(dt,'123'),dt,'Not Match','Match') With_Replace
12* FROM tbl
SQL> /
DT       WITH_CASE   WITH_REGE WITH_INST WITH_REPL
201aaa   Not Matched Not Match Not Match Not Match
123bbb   Match       Match     Match     Match
567ccc   Not Matched Not Match Not Match Not Match
ab123ddd Match       Match     Match     MatchEdited by: Saubhik on Jul 26, 2010 5:24 AM
Edited by: Saubhik on Jul 26, 2010 5:40 AM
Edited by: Saubhik on Jul 26, 2010 5:40 AM

LIKE operator is not working in SQL Query in XML file

Hi Gurus,
LIKE operator is not working in SQL query in XML template.
I am creating a PDF report in ADF using Jdeveloper10g. The XML template is as follows
<?xml version="1.0" encoding="WINDOWS-1252" ?>
<dataTemplate name="catalogDataTemplate" description="Magazine
Catalog" defaultPackage="" Version="1.0">
<parameters>
<parameter name="id" dataType="number" />
<parameter name="ename" dataType="character" />
</parameters>
<dataQuery>
<sqlStatement name="Q1">
<![CDATA[
SELECT ename, empno, job, mgr from EMP where deptno=:id and ename LIKE :ename || '%']]>
</sqlStatement>
</dataQuery>
<dataStructure>
<group name="EmployeeInfo" source="Q1">
<element name="EmployeeName" value="ename" />
<element name="EMPNO" value="empno" />
<element name="JOB" value="job"/>
<element name="MANAGER" value="mgr" />
</group>
</dataStructure>
</dataTemplate>
if i pass the parameter value of :ename from UI, it doesn't filter. But if I give ename = :ename it retrieves the data. Can anyone help me why LIKE operator doesn't work here?
Appreciate your help,
Shyamal
email: [email protected]

Hi
Well for a start, you are doing some very strange conversions there. For example...
and to_char(a.msd, 'MM/DD/YYYY') != '11/11/2030'
and to_char(a.msd, 'MM/DD/YYYY') != '10/10/2030'If a.msd is a date then you should e converting on the other side ie.
and a.msd != TO_DATE('11/11/2030', 'MM/DD/YYYY')
and a.msd != TO_DATE('10/10/2030', 'MM/DD/YYYY')Also, you may want to take into consideration nothing being input in :P2_ITEM_NUMBER like this...
AND INSTR(a.item_number,NVL(:P2_ITEM_NUMBER,a.item_number)) > 0Is item number actually a number or char field? If it's a number, you want to explicitly convert it to a string for using INSTR like this...
AND INSTR(TO_CHAR(a.item_number),NVL(TO_CHAR(:P2_ITEM_NUMBER),TO_CHAR(a.item_number))) > 0?
Cheers
Ben

Problem with LIKE operator in select query

Hi,
I want to compare one field using LIKE operator. But i m not able to do that.
DATA: l_doctext type c value ''''.
CONCATENATE l_doctext s_lbktxt-low '%' l_doctext INTO s_lbktxt-low.
SELECT bukrs belnr gjahr blart bldat budat xblnr bktxt waers awtyp
            FROM bkpf INTO TABLE g_t_bkpf_labor
            FOR ALL ENTRIES IN g_t_bseg_unique
            WHERE bukrs = g_t_bseg_unique-bukrs
            AND belnr = g_t_bseg_unique-belnr
            AND gjahr = g_t_bseg_unique-gjahr
            AND blart = p_ldtype
            AND bktxt LIKE s_lbktxt-low.
plz help. Am i dng something wrong.
Value in s_lbktxt can be like 'TEA.....'

hi ,
check this program..
tables:mara.
data: begin of it_mara occurs 0,
      matnr like mara-matnr,
      meins like mara-meins ,
      mtart like mara-mtart,
      end of it_mara.
select-options: s_matnr for mara-matnr.
      select matnr
             meins
             mtart
             from mara
             into table it_mara
             where matnr like '%7'.
sort it_mara by matnr.
loop at it_mara.
write:/ it_mara-matnr,
it_mara-meins,
it_mara-mtart.
endloop.
regards,
venkat.

Like operator in a query

I need a user to be able to enter a city to pull up results
for that city using a LIKE operator. However, if the master list
contains St. Paul, instead of Saint Paul, how can I get either one
to show up? I've tried several things and I just can't get it to
work!!! Thanks!

I have had code like some below but it slows thing down
because indexes can't be used. Instead for searches that don't have
to be exactly up to date I build a work file that is in a
standardized format nightly but it could be done by triggers. This
code is for Oracle.
where
( length(
translate(
UPPER(LTRIM(RTRIM('#Form.StreetName#'))
'A,._%1234567890'
,'A')
) >= 4 AND
V.StNum = '#Form.StreetNumber#'
<CFIF '#Form.StreetDirection#' NEQ ''>
and V.stdir = '#Form.StreetDirection#'
</cfif>
and (
V.stName LIKE RTRIM(SUBSTR(
DECODE(
SUBSTR(translate(UPPER(LTRIM(RTRIM('#Form.StreetName#'))),'A`''_,.%','A')
||'
',1,INSTR(translate(UPPER(LTRIM(RTRIM('#Form.StreetName#'))),'A`''_,.%','A')
||' ',' ',1,1)-1)
,'1','FIRST'
,'2','SECOND'
,'3','THIRD'
,'4','FOURTH'
,'5','FIFTH'
,'6','SIXTH'
,'7','SEVENTH'
,'8','EIGHTH'
,'9','NINTH'
,'10','TENTH'
,'11','ELEVENTH'
,'12','TWELVTH'
,'1ST','FIRST'
,'2ND','SECOND'
,'3RD','THIRD'
,'4TH','FOURTH'
,'5TH','FIFTH'
,'6TH','SIXTH'
,'7TH','SEVENTH'
,'8TH','EIGHTH'
,'9TH','NINTH'
,'10TH','TENTH'
,'11TH','ELEVENTH'
,'12TH','TWELVTH'
,'E','EAST'
,'N','NORTH'
,'S','SOUTH'
,'W','WEST'
,'SE','SOUTHEAST'
,'SW','SOUTHWEST'
,'SAINT','ST'
,'MT','MOUNT'
,'CT','COURT'
,'CORP','CORPORATE'
,SUBSTR(translate(UPPER(LTRIM(RTRIM('#Form.StreetName#'))),'A`''_,.%','A')
||'
',1,INSTR(translate(UPPER(LTRIM(RTRIM('#Form.StreetName#'))),'A`''_,.%','A')
||' ',' ',1,1)-1))
||
DECODE(instr(ltrim(rtrim('#Form.StreetName#')),' ',1,1),0,'',
' '||
SUBSTR(translate(UPPER(LTRIM(RTRIM('#Form.StreetName#'))),'A`''_,.%','A')
||'
',INSTR(translate(UPPER(LTRIM(RTRIM('#Form.StreetName#'))),'A`''_,.%','A')
||' ',' ',1,1)+1,
INSTR(translate(UPPER(LTRIM(RTRIM('#Form.StreetName#'))),'A`''_,.%','A')
||' ','
',-2,1)-INSTR(translate(UPPER(LTRIM(RTRIM('#Form.StreetName#')))
,'`''_,.%','%%')||' ',' ',1,1))
||
DECODE(
RTRIM(SUBSTR(translate(UPPER(LTRIM(RTRIM('#Form.StreetName#'))),'A`''_,.%','A')
||'
',INSTR(translate(UPPER(LTRIM(RTRIM('#Form.StreetName#'))),'A`''_,.%','A')
||' ',' ',-2,1)+1))
,'AVENUE','AV'
,'AVE','AV'
,'BOULEVARD','BL'
,'BLVD','BL'
,'COURT','CT'
,'CRT','CT'
,'DRIVE','DR'
,'LANE','LN'
,'PARK','PK'
,'PLACE','PL'
,'POINT','PT'
,'POINTE','PT'
,'ROAD','RD'
,'SQUARE','SQ'
,'STREET','ST'
,'STR','ST'
,'TRACE','TR'
,'TRAIL','TR'
,'CIRCLE','CIR'
,'CR','CIR'
,'EXTENSION','EXT'
,'HIGHWAY','HWY'
,'HIWAY','HWY'
,'HIWY','HWY'
,'PIKE','PKE'
,'RW','ROW'
,'RN','RUN'
,'TERRACE','TER'
,'WY','WAY'
,RTRIM(SUBSTR(translate(UPPER(LTRIM(RTRIM('#Form.StreetName#'))),'A`''_,.%','A')
||'
',INSTR(translate(UPPER(LTRIM(RTRIM('#Form.StreetName#'))),'A`''_,.%','A')
||' ',' ',-2,1)+1)))
),1,4))
||'%'
OR
V.stName LIKE RTRIM(SUBSTR(
DECODE(
SUBSTR(translate(UPPER(LTRIM(RTRIM('#Form.StreetName#'))),'A`''_,.%','A')
||'
',1,INSTR(translate(UPPER(LTRIM(RTRIM('#Form.StreetName#'))),'A`''_,.%','A')
||' ',' ',1,1)-1)
,'1','FIRST'
,'2','SECOND'
,'3','THIRD'
,'4','FOURTH'
,'5','FIFTH'
,'6','SIXTH'
,'7','SEVENTH'
,'8','EIGHTH'
,'9','NINTH'
,'10','TENTH'
,'11','ELEVENTH'
,'12','TWELVTH'
,'1ST','FIRST'
,'2ND','SECOND'
,'3RD','THIRD'
,'4TH','FOURTH'
,'5TH','FIFTH'
,'6TH','SIXTH'
,'7TH','SEVENTH'
,'8TH','EIGHTH'
,'9TH','NINTH'
,'10TH','TENTH'
,'11TH','ELEVENTH'
,'12TH','TWELVTH'
,'E','EAST'
,'N','NORTH'
,'S','SOUTH'
,'W','WEST'
,'SE','SOUTHEAST'
,'SW','SOUTHWEST'
,'SAINT','ST'
,'MOUNT','MT'
,'CT','COURT'
,'CORP','CORPORATE'
,SUBSTR(translate(UPPER(LTRIM(RTRIM('#Form.StreetName#'))),'A`''_,.%','A')
||'
',1,INSTR(translate(UPPER(LTRIM(RTRIM('#Form.StreetName#'))),'A`''_,.%','A')
||' ',' ',1,1)-1))
||
DECODE(instr(ltrim(rtrim('#Form.StreetName#')),' ',1,1),0,'',
' '||
SUBSTR(translate(UPPER(LTRIM(RTRIM('#Form.StreetName#'))),'A`''_,.%','A')
||'
',INSTR(translate(UPPER(LTRIM(RTRIM('#Form.StreetName#'))),'A`''_,.%','A')
||' ',' ',1,1)+1,
INSTR(translate(UPPER(LTRIM(RTRIM('#Form.StreetName#'))),'A`''_,.%','A')
||' ','
',-2,1)-INSTR(translate(UPPER(LTRIM(RTRIM('#Form.StreetName#')))
,'`''_,.%','%%')||' ',' ',1,1))
||
DECODE(
RTRIM(SUBSTR(translate(UPPER(LTRIM(RTRIM('#Form.StreetName#'))),'A`''_,.%','A')
||'
',INSTR(translate(UPPER(LTRIM(RTRIM('#Form.StreetName#'))),'A`''_,.%','A')
||' ',' ',-2,1)+1))
,'AVENUE','AV'
,'AVE','AV'
,'BOULEVARD','BL'
,'BLVD','BL'
,'COURT','CT'
,'CRT','CT'
,'DRIVE','DR'
,'LANE','LN'
,'PARK','PK'
,'PLACE','PL'
,'POINT','PT'
,'POINTE','PT'
,'ROAD','RD'
,'SQUARE','SQ'
,'STREET','ST'
,'STR','ST'
,'TRACE','TR'
,'TRAIL','TR'
,'CIRCLE','CIR'
,'CR','CIR'
,'EXTENSION','EXT'
,'HIGHWAY','HWY'
,'HIWAY','HWY'
,'HIWY','HWY'
,'PIKE','PKE'
,'RW','ROW'
,'RN','RUN'
,'TERRACE','TER'
,'WY','WAY'
,RTRIM(SUBSTR(translate(UPPER(LTRIM(RTRIM('#Form.StreetName#'))),'A`''_,.%','A')
||'
',INSTR(translate(UPPER(LTRIM(RTRIM('#Form.StreetName#'))),'A`''_,.%','A')
||' ',' ',-2,1)+1)))
),1,4))
||'%' )

Problem in JDBC , when using LIKE operator. - VERY URGENT

Problem in JDBC , when using LIKE operator.
LINE 1 : String temp = "AA";
LINE 2 : String query = "select * from emp where EMPNAME like '*temp*' ";
LINE 3 : Staement st = con.createStaement();
LINE 4 : ResultSet rs = st.executeQuery(query);
'*' character is not getting evaluated. In MS ACCESS2000 only * is accepted instead of '%'. Moreover in MS ACCESS the like operator has to be used within double quotes as a String. whereas in other databases, it accepts single quotes as a String.
Ex:
In MS ACCESS
     select * from emp where ename like "*aa*";
Other Databases
     select * from emp where ename like '%aa%';
In my situation iam passing a Variable inside a like operator and '*' is used.
For the above Scenario, Please help me out.
If possible Kindly let me know the exact Syntax.
Please give me the answer as LINE1,LINE2,LINE3,LINE4,
I have verified in JDBC Spec also, it has been specified to use escape sequence.that too did not work.
Due to this, My project is in hold for about 4 days. I could not find a suitable solution.
Please help me out.

I made a LIKE clause work with M$ Access, using PreparedStatement and the % wildcard:
            escapeStr                   = "%";
            String sql                  = "SELECT USERNAME, PASSWORD FROM USERS WHERE USERNAME LIKE ?";
            PreparedStatement statement = connection.prepareStatement(sql);
            statement.setString(1, ("user" + escapeStr));
            ResultSet resultSet         = statement.executeQuery();
            while (resultSet.next())
                System.out.println("username: " + resultSet.getObject("USERNAME") + " password: " + resultSet.getObject("PASSWORD"));

Case Insensitive Search coupled with "LIKE" operator.

Greetings All, I am running Oracle 11gR1 RAC patchet 25 on Windows X64.
This db supports and application that requires case insensitive searches.
Because there are a few entry points into the db I created an "after login" trigger:
CREATE OR REPLACE TRIGGER MyAppAfterLogon_TRGR
AFTER LOGON
ON DATABASE
DECLARE
vDDL VARCHAR2(200) := 'alter session set nls_comp=''linguistic''';
vDDL2 VARCHAR2(200) := 'alter session set nls_sort=''binary_ci''';
BEGIN
IF ((USER = 'MyAppUSER') OR(USER = 'MyAppREPORTINGUSER')) THEN
EXECUTE IMMEDIATE vDDL;
EXECUTE IMMEDIATE vDDL2;
END IF;
END MyAppAfterLogon_TRGR;
This ensures that everyone connecting to the DB via any mechanism will automatically have case insensitive searches.
Now, to optimize the know queries I created the standard index to support normal matching queries:
select * from MyTable where Name = 'STEVE';
The index looks like:
CREATE INDEX "CONTACT_IDX3 ON MYTABLE (NLSSORT("NAME",'nls_sort=''BINARY_CI'''))
This all works fine, no issues.
The problem is when I write a query that uses the "LIKE" operator:
select * from MyTable where Name like 'STEV%';
I get back the record set I expect. However, my index is not used? I can't for the life of me get this query to use an index.
The table has about 600,000 rows and I have run gather schema stats.
Does anyone know of any issues with case insensitive searches and the "LIKE" clause?
Any and all help would be appreciated.
L

I think there is issue with your logon trigger :
"IF ((USER = 'MyAppUSER') OR(USER = 'MyAppREPORTINGUSER')) THEN"
it should be :
IF UPPER(USER) = 'MYAPPUSER' OR UPPER(USER) = 'MYAPPREPORTINGUSER' THEN
because user name stored in Upper case. Check and try.
HTH
Girish Sharma

How does this LIKE operator work ?

Values JOHN and KEITH have spaces in the string.
create table string_test ( test_str varchar2(15));
insert into string_test values ('JO HN');
insert into string_test values ('JOHN');
insert into string_test values ('RAM');
insert into string_test values ('KEITH ');
SQL> select * from string_test;
TEST_STR
JO HN
JOHN
RAM
KEITHFrom OTN , i found the query to find all string values which has a white space in it.
select * from string_test where test_str like '%' || chr(32) || '%';But, i don't understand how this works. Won't the percent sign in single quotes ('%') be considered a literal ?

GarryB wrote:
Values JOHN and KEITH have spaces in the string.
create table string_test ( test_str varchar2(15));
insert into string_test values ('JO HN');
insert into string_test values ('JOHN');
insert into string_test values ('RAM');
insert into string_test values ('KEITH ');
SQL> select * from string_test;
TEST_STR
JO HN
JOHN
RAM
KEITHFrom OTN , i found the query to find all string values which has a white space in it.
select * from string_test where test_str like '%' || chr(32) || '%';But, i don't understand how this works. Won't the percent sign in single quotes ('%') be considered a literal ?No, because the "%" sign has special meaning to the LIKE operator. It's a wildcard meaning any characters.

Doubt in like operator

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