I have the following issue:
I have this table:
MyUser(
ID Number,
Name Varchar2,
Username Varchar2,
Password Varchar2,
etc)
If I run the Select * from MyUser; statement I get all the rows of the table.
However if I run this statement Select * from MyUser where Username = 'someUsername'; I don't get any rows at all. (Yes, I've made sure I have a row with a username 'someUsername').
Try this:
SELECT *
FROM MYUSER
WHERE UPPER(USERNAME) LIKE '%SOMEUSERNAME%'
Share and enjoy.
Related
(question from slack)
The following script uses the index in the last select on postgres but not on yugabyte.
drop table if exists entry2;
CREATE TABLE entry2 (comp_id int,
path varchar,
index varchar,
archtype varchar,
other JSONB,
PRIMARY KEY (comp_id, path,index));
DO $$
BEGIN
FOR counter IN 1..200000 BY 1 LOOP
insert into entry2 values (counter,'/content[open XXX- XXX-OBSERVATION.blood_pressure.v1,0]','0','open XXX- XXX-OBSERVATION.blood_pressure.v1','{"data[at0001]/events[at0006]/data[at0003]/items[at0004]/value/value" :132,"data[at0001]/events[at0006]/data[at0003]/items[at0005]/value/value": 92}');
insert into entry2 values (counter,'/content[open XXX- XXX-OBSERVATION.blood_pressure.v1,0]','1','open XXX- XXX-OBSERVATION.blood_pressure.v1',('{"data[at0001]/events[at0006]/data[at0003]/items[at0004]/value/value" :'||(130+ counter) ||',"data[at0001]/events[at0006]/data[at0003]/items[at0005]/value/value": 90}')::jsonb);
insert into entry2 values (counter,'/content[open XXX- XXX-OBSERVATION.heart_rate-pulse.v1,0]','0','open XXX- XXX-OBSERVATION.heart_rate-pulse.v1','{"data[at0001]/events[at0006]/data[at0003]/items[at0004]/value/value" :132,"/data[at0002]/events[at0003]/data[at0001]/items[at0004]/value/value": 113}');
END LOOP;
END; $$;
drop index if exists blood_pr;
create index blood_pr on entry2(((other ->> 'data[at0001]/events[at0006]/data[at0003]/items[at0004]/value/value')::integer ));
explain analyse
select (other ->> 'data[at0001]/events[at0006]/data[at0003]/items[at0004]/value/value')::integer from entry2
where (other ->> 'data[at0001]/events[at0006]/data[at0003]/items[at0004]/value/value')::integer > 140
order by (other ->> 'data[at0001]/events[at0006]/data[at0003]/items[at0004]/value/value')::integer::integer
limit 10
;
PostgreSQL uses the index to avoid a sort and then get immediately the first 10 rows
In PostgreSQL the index is used to avoid a sort because the order of the index is the same as the order by. Sorted indexes (B-Tree) are the default in PostgreSQL but not in YugabyteDB which is a distributed SQL database where indexes are hash-sharded by default on the first column. You can create it as range-sharded with ASC or DESC:
create index blood_pr on entry2(((other ->> 'data[at0001]/events[at0006]/data[at0003]/items[at0004]/value/value')::integer ) ASC);
I create entity
#Entity({ name: 'MYTABLE.TITLE' })
export class MyEntity {
#PrimaryGeneratedColumn()
id: number;
....
}
And when execute in my service
this.baseRepo.find()
in logs I have got some worst query, smth like this shit:
SELECT "MyEntity".id ... FROM "MYTABLE"."NAME"
What is problem, why I haven't access to table with names separated with dot?
If this has something to do with an Oracle database (apparently, it does as you used that tag), then: dot can't be part of table name:
SQL> create table mytable.name (id number);
create table mytable.name (id number)
*
ERROR at line 1:
ORA-01918: user 'MYTABLE' does not exist
unless you enclose it into double quotes:
SQL> create table "myTAbLe.nAme" (id number);
Table created.
but that means that you have to enclose it into double quotes, following exactly the same letter case every time you reference it:
SQL> select * from mytable.name;
select * from mytable.name
*
ERROR at line 1:
ORA-00942: table or view does not exist
SQL> select * from "mytable.name";
select * from "mytable.name"
*
ERROR at line 1:
ORA-00942: table or view does not exist
SQL> select * from "MyTAbLe.nAme";
select * from "MyTAbLe.nAme"
*
ERROR at line 1:
ORA-00942: table or view does not exist
SQL> select * from "myTAbLe.nAme";
no rows selected
SQL>
That's why it is - generally speaking - a really, Really, REALLY bad idea to do so in Oracle. Create it without double quotes (of course, don't use a dot - what's wrong with an underline?), use any letter case you want (because Oracle will store it into the data dictionary in uppercase), reference it using any letter case you want:
SQL> create table mytable_name(id number);
Table created.
SQL> select * From mytable_name;
no rows selected
SQL> select * from MYTAble_NaMe;
no rows selected
SQL> select * from MYTABLE_NAME;
no rows selected
SQL>
Just use #Entity({ name: 'TITLE', schema: 'MYTABLE' })
I have different databases. I have tables within each database.
I would like to know if I can ask how many databases excluding some such as 'schema' 'mysql' I have once know how to perform a subquery asked by a particular table of all the databases resulting from the first question.
example.
the structure would be
db1 -> user-> id,name,imei,telephone,etc..
db2 -> user-> id,nameuser,imei,telephone,etc..
db3 -> user-> id,nameuser,imei,telephone,etc..
....
db1000 -> user-> id,nameuser,imei,telephone,etc..
the query are how this, but this get error
SELECT CONCAT('SELECT * FROM ' schema_name 'where imei.'schema_name = nameimai)
FROM information_schema.schemata
WHERE schema_name NOT IN ('information_schema','mysql','performance_schema','sys','performance_schema','phpmyadmin');
Results
name db id name imei phone
---------- ---------- ---------- ---------- ----------
db1 1 John 76876876 xxx
db2 2300 John 76876876 xxxx
...
db1000 45 John 76876876 xxx
its possible in one query
thanks..
Here's one way you could do it with a stored procedure.
If I understand correctly, you have multiple databases with identical tables (user) and you want to run a query against all these tables for a specific value.
I've made this fairly general so that you can pass in the table name and also the where clause. Your example seemed to be looking for user records with imei = '76876876', so if we use that example.
USE test;
DELIMITER //
DROP PROCEDURE IF EXISTS multidb_select //
-- escape any quotes in the query string
-- call multidb_select ('usertest','WHERE imei = \'76876876\'')
CREATE PROCEDURE multidb_select(IN tname VARCHAR(64), IN qwhere VARCHAR(1024))
READS SQL DATA
BEGIN
DECLARE vtable_schema VARCHAR(64);
DECLARE vtable_name VARCHAR(64);
DECLARE done BOOLEAN DEFAULT FALSE;
-- exclude views and system tables
DECLARE cur1 CURSOR FOR
SELECT `table_schema`, `table_name`
FROM `information_schema`.`tables`
WHERE `table_name` = tname
AND `table_type` = 'BASE TABLE'
AND `table_schema` NOT IN
('information_schema','mysql','performance_schema',
'sys','performance_schema','phpmyadmin')
ORDER BY `table_schema` ASC;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done := TRUE;
OPEN cur1;
SET #unionall := '';
read_loop: LOOP
FETCH cur1 INTO vtable_schema, vtable_name;
IF done THEN
LEAVE read_loop;
END IF;
-- UNION ALL in case the id is the same
IF CHAR_LENGTH(#unionall) = 0 THEN
SET #unionall =
CONCAT("SELECT \'", vtable_schema , "\' AS 'Db', t.* FROM `",
vtable_schema, "`.`" , vtable_name, "` t ", qwhere);
ELSE
SET #unionall =
CONCAT(#unionall, " UNION ALL SELECT \'", vtable_schema ,
"\' AS 'Db', t.* FROM `", vtable_schema,
"`.`", vtable_name, "` t ", qwhere);
END IF;
END LOOP;
CLOSE cur1;
PREPARE stmt FROM #unionall;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
END //
DELIMITER ;
Run it with
call test.multidb_select('user','WHERE imei = \'76876876\'')
var searchValue = 'shahid';
var query = ("select * from students where name ilike '%"+searchValue+"%'");
This is my psql query, but it is not returning any values. So that I just console the query to know the execution.
The query is executing as:
select * from students where name ilike 'hahid%'
When I capitalize the first letter of search value (Shahid), it's executing perfectly.
If you want to pass in the upper case you should convert the variable searchValue
eg.
var newSearchValue = (select initcatp(searchValue)) ;
This will convert 'shahid' to 'Shahid' Then use this in your query variable.
This, lacking a '%' on the left hand side, will only match thing that start with hahid
select * from students where name ilike 'hahid%'
It's not the same as this
select * from students where name ilike 'Shahid%'
which will match only things that start with Shahid. Now if you want something that will match anything with hahid then you want
select * from students where name ilike '%hahid%'
BTW, your example is extremely insecure if searchValue comes from I/O (user, file, network etc).
I have defined a table type PL/SQL variable and added some data there.
create or replace type varTableType as table of varchar2(32767);
my_table varTableType := varTableType()
...
my_table := some_function();
Now I have this my_table table type variable with several thousands of records.
I have to select only those records ending with specific character, say 'a' and get results in a comma separated string.
I think that COLLECT function could do this, but I do not understand exactly how.
I am using Oracle 10g.
Without getting into the question- why are you using a table type and not a table (or temporary table), you can do it like this:
declare
my_table varTableType;
i varchar2(32767);
begin
my_table := new
varTableType('bbbb', 'ccca', 'ddda', 'eee', 'fffa', 'gggg');
select trim(xmlagg(xmlelement(e, column_value || ','))
.extract('//text()'))
into i
from table(my_table)
where column_value like '%a';
dbms_output.put_line(i);
end;
There are more ways to concat rows- WM_CONCAT (if enabled) or LISTAGG (since 11g R2) but the basic idea of
select column_value
from table(my_table)
where column_value like '%a';
stays
There is another way without sql:
declare
my_table varTableType;
i varchar2(32767);
begin
my_table := new
varTableType('bbbb', 'ccca', 'ddda', 'eee', 'fffa', 'gggg');
FOR j IN my_table.first .. my_table.last LOOP
IF my_table(j) like '%a' THEN
i := i || my_table(j);
END IF;
END LOOP;
dbms_output.put_line(i);
end;
See this blog post by Tim Hall for a number of ways to do this, depending on Oracle version.