I'm looking for a way to create a query through a winform application to query an Oracle database but ignoring the case of the data. Is this possible to do without having to modify anything in Oracle itself?
You could simply upper- or lowercase all:
SELECT Columns From Table WHERE UPPER(ColName) = :UpperValue
Then use ToUpper on the value:
yourOracleCommand.Parameters.AddWithValue("UpperValue", value.ToUpper())
Related
Is there a way in PostgreSQL to access fields without explicitly providing the column name? For example, instead of the statement:
select (col1,col2,col3,...col42) from foo_table;
there's a (possible) alternative of:
select (1:42) from foo_table;
There is no such syntax in Postgres' SQL.
You could always resort to having code that dynamically constructs the query for you before executing it, but that's about as good as it will get.
Lets say I have a query like this:
Parameters Table_Name string, Field_Name string;
Update Table_Name Set Table_Name.[field1] = "new value", Table_Name.[field2] = "new Value" Where Table_Name.[Field_Name] = "Some value"
Basically I have the same query which I need to run against different tables which share some fields together. I want to be able to type the table name when I run the query.
I know this can be achieved with VBA, but this way would be a lot easier than VBA. Although VBA is also welcome but I would like to be able to do this in pure SQL.
How to achieve the above logic for table names AND field names?
Is this being done in MSAccess or in SQL Server? If you've got a SQL Server behind things, then you'll be looking to do some sp_executesql calls to get the job done. If you're doing this in MSAccess, you can accomplish the same by building dynamic SQL statements in VBA - either way would work if you've got Access pointing to SQL, though.
This I am sure is a fairly simple question. Clients are entering data into a column that looks like this 600/4768/4. I need to be able to remove the / once the data has been entered. How would I do this?
It is usually entered in this format as it is being referenced from another source in this pattern.
You could do it either in program before data is submitted, or in sql. Exactly how depends on what you're programming with, an what database you're using.
in MySql you can do this: replace('00/4768/4', '/', ''); Most any rdbms will have a similar function.
http://dev.mysql.com/doc/refman/5.6/en/string-functions.html#function_replace
I usually find it's easier to do this kind of thing in the program than in sql though.
Using SQL SERVER you can try REPLACE (Transact-SQL)
Replaces all occurrences of a specified string value with another
string value.
Usage:
SELECT REPLACE('abcdefghicde','cde','xxx');
You can use REPLACE function in your SQL query:
replace( string1, string_to_replace, [ replacement_string ] )
select REPLACE('600/4768/4','/','')
While user enters the data take it and then replace the "/" and then store in the table
While inserting client data in to column you can use the REPLACE function, I believe, you are using SQLServer. Below is the example how you can use replace.
REPLACE('600/4768/4','/','');
USe REPLACE if you want to update in SQL
like
REPLACE(<column_Name>,'/',' ')
whole query will look like
Update <table_name>
set <column_Name> = REPLACE(<column_Name>,'/','')
hope this helps
is there a way to actually query the database in a such a way to search for a particular value in every table across the whole database ?
Something like a file search in Eclipse, it searches accross the whole worspace and project ?
Sorry about that .. its MS SQL 2005
SQL Workbench/J has a built in tool and command to do that.
It's JDBC based and should also work with SQL Server.
You will need to use the LIKE operator, and search through each field separately. i.e.
SELECT * FROM <table name>
WHERE (<field name1> LIKE '%<search value>%') OR
(<field name2> LIKE '%<search value>%') OR
... etc.
This isn't a quick way though.
I think the best way would be to
1) programatically generate the query and run it
2) use a GUI tool for the SQL server you are using which provides this functionality.
In mysql you can use union operator like
(SELECT * from table A where name = 'abc') UNION (SELECT * from
table B where middlename = 'pqr')
and so on
use full text search for efficency
http://dev.mysql.com/doc/refman/5.0/en/fulltext-search.html
Well, your best bet is to write a procedure to do this. But to give you some pointers you can use the INFORMATION_SCHEMA.Tables to get a list of all the tables in a given database and INFORMATION_SCHEMA.Columns to get a list of all columns. These tables also give you the datatype of columns. So you will need a few loops on these tables to do the magic.
It should be mentioned most RDBMSs nowadays support these schemas.
In phpmyadmin, go to your database, reach the search tab.
Here you will be able to select all of your tables and search through your entire db in one time.
I have a question regarding SQL. I have the following SQL statement:
SELECT id, First, Last, E_Mail, Notes
FROM mytable
WHERE SOMETHING_SHOULD_BE_HERE IS NOT NULL;
I know that the SOMETHING_SHOULD_BE_HERE should be a column(attribute) in my table. Is their a way I can put a variable that can refer to the column I'm trying to access? In my case their are 30 columns. Can I have a string for SOMETHING_SHOULD_BE_HERE that can be assigned in my program to the column in which I want to search?
Thanks
No. Variables in SQL can refer to data, but not to object names (columns, functions or other database objects).
If you are building the SQL query, you'll need to use string operations to build your query.
The column can't be variable, but the value of the column can. The parser needs to know what to bind to.
If you elaborate on what you're trying to solve and which platform you're using it would allow for more complete answers.
You can have different SQLs queries in your code and use each one according to the case.
Another way is generate dynamically the query according the fields you want.
Without dynamic SQL, this is probably your best bet:
SELECT
id, first, last, email, notes
FROM
My_Table
WHERE
CASE #column_name_variable
WHEN 'column_1' THEN column_1
WHEN 'column_2' THEN column_2
...
ELSE 'not null'
END IS NOT NULL
There might be some issues with data type conversions, so you might need to explicitly cast all of the columns to one data type (VARCHAR is probably the best bet). Also, there's a good chance that performance will be horrendous on this query. I'd test it thoroughly before even thinking about implementing something like this.
I mentioned this in my comment, but for completeness I'll put it here too... you can probably also accomplish this with dynamic SQL, but how you do that will depend on your database server (MS SQL Server, Oracle, mySQL, etc.) and there are usually some caveats to using dynamic SQL.
In JDBC program, yes,the select statement can be composed like string operation.
for(String colName: colList)
{
String sql="Select id, First, Last, E_Mail, Notes From mytable where "+colName+" IS NOT NULL";
//execute the sql statement
}
It depends on how you are going to find out the value of SOMETHING_SHOULD_BE_HERE.
If you are in an Oracle PLS/SQL environment you could build up the WHERE clause using dynamic SQL and then use EXECUTE IMMEDIATE to execute it.
If you have a small set number of possibilities you could use CASE to workaround your problem possibly.
Your question is unclear.
However I am quite sure that what you have in mind is the so-called dynamic SQL (and related). "Dynamic SQL" allows you to dynamically build and submit queries at runtime. However such functionalities may not exist for your RDBMS.
There are several ways to do this.
When your query would return one and only one row
then you have to consider the EXECUTE IMMEDIATE statements (along with sp_executesql in tSQL : http://msdn.microsoft.com/en-us/library/ms188001.aspx ; or the USING clause in PL/SQL : http://docs.oracle.com/cd/B14117_01/appdev.101/b10807/13_elems017.htm to specify a list of input/output bind arguments) and/or PREPARED statements (http://rpbouman.blogspot.fr/2005/11/mysql-5-prepared-statement-syntax-and.html).
When your query can return more than one row
then you have to consider techniques such as the EXECUTE IMMEDIATE statement with the BULK COLLECT INTO clause or the OPEN-FOR, FETCH, and CLOSE statements (explicit cursors in PL/SQL :
http://docs.oracle.com/cd/B28359_01/appdev.111/b28370/dynamic.htm)
Please note that except in some particular cases, most conventional techniques like IF-THEN-ELSE and CASE statements should be preferred (along with a good algorithm). Furthermore they work with almost all RDBMS.