I feel like this should be simple enough to do, but have not found any solutions that didn't use replace so far. I have the following select statement I am running, and for some of the columns there are commas separating the values. I would like to replace these commas with semicolons, however I only want to do it in the select statement. I don't want it to alter the values in the tables at all. This is not a one off statement either, or I'd just replace all the commas with semicolons and then revert back.
SELECT a.Category_Id, a.Category_Name, ISNULL(b.Category_Alias, '') as Category_Alias,
ISNULL(b.SUPPORT_NAMES, '') as SUPPORT_NAMES
FROM Categories a
INNER JOIN CategoryInfo b on b.Category_Id=a.Category_Id
For the Category_Alias column, the records are actually stored like CS, Customer Support and I want that to show up as CS; Customer Support just for the select statement.
I believe you may be confused as to what the REPLACE function is doing. You can use REPLACE within your SELECT statement without altering the data in the database:
SELECT REPLACE(MyField, ',', ';') AS NewFieldName
FROM MyTable
I believe you don't want to replace the value physically in the table, but ok to replace on select
So you can
Select REPLACE(ColumnName,',',';')
From TableName
Most SQL servers implement an inline replace function. Most of them are named replace(), and can also be used in a select statement.
Example from MySQL:
SELECT field, REPLACE(field,',',';') FROM my_table;
Related
I have a large list of SQL commands such as
SELECT * FROM TEST_TABLE
INSERT .....
UPDATE .....
SELECT * FROM ....
etc. My goal is to parse this list into a set of results so that I can easily determine a good count of how many of these statements are SELECT statements, how many are UPDATES, etc.
so I would be looking at a result set such as
SELECT 2
INSERT 1
UPDATE 1
...
I figured I could do this with Regex, but I'm a bit lost other than simply looking at everything string and comparing against 'SELECT' as a prefix, but this can run into multiple issues. Is there any other way to format this using REGEX?
You can add the SQL statements to a table and run them through a SQL query. If the SQL text is in a column called SQL_TEXT, you can get the SQL command type using this:
upper(regexp_substr(trim(regexp_replace(SQL_TEXT, '\\s', ' ')),
'^([\\w\\-]+)')) as COMMAND_TYPE
You'll need to do some clean up to create a column that indicates the type of statement you have. The rest is just basic aggregation
with cte as
(select *, trim(lower(split_part(regexp_replace(col, '\\s', ' '),' ',1))) as statement
from t)
select statement, count(*) as freq
from cte
group by statement;
SQL is a language and needs a parser to turn it from text into a structure. Regular expressions can only do part of the work (such as lexing).
Regular Expression Vs. String Parsing
You will have to limit your ambition if you want to restrict yourself to using regular expressions.
Still you can get some distance if you so want. A quick search found this random example of tokenizing MySQL SQL statements using regex https://swanhart.livejournal.com/130191.html
My data contains numbers like 100,000.89 and so on. What function should I use in Redshift to remove the comma and keep it like 100000.89? Do we write the function while creating a table since it is at column level or after its creation and then post process the table?
To remove commas from text columns, use replace():
select replace(col, ',', '')
from t
EDIT : In case of null data use coalesce() :
select coalesce(replace(col,',', ''), '')
from t
I just added all the columns in my insert query with coalesce since all of them somewhere had null values and it worked like a charm. The redshift error for missing data in not null fields is misleading here as mentioned : https://forums.aws.amazon.com/thread.jspa?threadID=119640
I changed my copy command too, and added BLANKSASNULL. This worked! Thanks for all your help. Below is my command:
insert into test.t_final
(select
coalesce(project_number) as project_number,
coalesce(contract_po) as contract_po,
coalesce(tracking_date) as tracking_date,
(coalesce(replace(amount,',',''))) as amount,
(coalesce(replace(tax,',',''))) as tax,
(coalesce(replace(contract_value,',',''))) as contract_value,
coalesce(comments) from test.t)
I am trying to concatenate multiple columns in a query in SQL Server 11.00.3393.
I tried the new function CONCAT() but it's not working when I use more than two columns.
So I wonder if that's the best way to solve the problem:
SELECT CONCAT(CONCAT(CONCAT(COLUMN1,COLUMN2),COLUMN3),COLUMN4) FROM myTable
I can't use COLUMN1 + COLUMN2 because of NULL values.
EDIT
If I try SELECT CONCAT('1','2','3') AS RESULT I get an error
The CONCAT function requires 2 argument(s)
Through discourse it's clear that the problem lies in using VS2010 to write the query, as it uses the canonical CONCAT() function which is limited to 2 parameters. There's probably a way to change that, but I'm not aware of it.
An alternative:
SELECT '1'+'2'+'3'
This approach requires non-string values to be cast/converted to strings, as well as NULL handling via ISNULL() or COALESCE():
SELECT ISNULL(CAST(Col1 AS VARCHAR(50)),'')
+ COALESCE(CONVERT(VARCHAR(50),Col2),'')
SELECT CONCAT(LOWER(LAST_NAME), UPPER(LAST_NAME)
INITCAP(LAST_NAME), HIRE DATE AS ‘up_low_init_hdate’)
FROM EMPLOYEES
WHERE HIRE DATE = 1995
Try using below:
SELECT
(RTRIM(LTRIM(col_1))) + (RTRIM(LTRIM(col_2))) AS Col_newname,
col_1,
col_2
FROM
s_cols
WHERE
col_any_condition = ''
;
Blockquote
Using concatenation in Oracle SQL is very easy and interesting. But don't know much about MS-SQL.
Blockquote
Here we go for Oracle :
Syntax:
SQL> select First_name||Last_Name as Employee
from employees;
Result: EMPLOYEE
EllenAbel
SundarAnde
MozheAtkinson
Here AS: keyword used as alias.
We can concatenate with NULL values.
e.g. : columnm1||Null
Suppose any of your columns contains a NULL value then the result will show only the value of that column which has value.
You can also use literal character string in concatenation.
e.g.
select column1||' is a '||column2
from tableName;
Result: column1 is a column2.
in between literal should be encolsed in single quotation. you cna exclude numbers.
NOTE: This is only for oracle server//SQL.
for anyone dealing with Snowflake
Try using CONCAT with multiple columns like so:
SELECT
CONCAT(col1, col2, col3) AS all_string_columns_together
, CONCAT(CAST(col4 AS VARCHAR(50), col1) AS string_and_int_column
FROM table
If the fields are nullable, then you'll have to handle those nulls. Remember that null is contagious, and concat('foo', null) simply results in NULL as well:
SELECT CONCAT(ISNULL(column1, ''),ISNULL(column2,'')) etc...
Basically test each field for nullness, and replace with an empty string if so.
I want to replace two things in one select statement. Now I can replace one character at a time. But as per my requirment, I need to replace two things in one statement.I want to replace one special character by Zero and another is this data is stored in multiple lines. I want to fetch this data in one line.
select replace(message,chr(ACII_Value),0)
from my_table -- I can replace special character by zero using this.
select (message,chr(10),' ')
from my_table -- I can put all data in single line using this.
Now I want to do this in one select statement.
select replace( replace( message, chr(ACII_Value), 0), chr(10), ' ')
from my_table;
An alternative is the TRANSLATE function:
select translate(message, chr(ASCII_Value)||chr(10), '0 ') from my_table;
Although if you're only replacing two characters, I'd go with #schurik's answer since it uses a simpler, more common function.
We need to store a select statement in a table
select * from table where col = 'col'
But the single quotes messes the insert statement up.
Is it possible to do this somehow?
From Oracle 10G on there is an alternative to doubling up the single quotes:
insert into mytable (mycol) values (q'"select * from table where col = 'col'"');
I used a double-quote character ("), but you can specify a different one e.g.:
insert into mytable (mycol) values (q'#select * from table where col = 'col'#');
The syntax of the literal is:
q'<special character><your string><special character>'
It isn't obviously more readable in a small example like this, but it pays off with large quantities of text e.g.
insert into mytable (mycol) values (
q'"select empno, ename, 'Hello' message
from emp
where job = 'Manager'
and name like 'K%'"'
);
How are you performing the insert? If you are using any sort of provider on the front end, then it should format the string for you so that quotes aren't an issue.
Basically, create a parameterized query and assign the value of the SQL statement to the parameter class instance, and let the db layer take care of it for you.
you can either use two quotes '' to represent a single quote ' or (with 10g+) you can also use a new notation:
SQL> select ' ''foo'' ' txt from dual;
TXT
-------
'foo'
SQL> select q'$ 'bar' $' txt from dual;
TXT
-------
'bar'
If you are using a programming language such as JAVA or C#, you can use prepared (parametrized) statements to put your values in and retrieve them.
If you are in SQLPlus you can escape the apostrophe like this:
insert into my_sql_table (sql_command)
values ('select * from table where col = ''col''');
Single quotes are escaped by duplicating them:
INSERT INTO foo (sql) VALUES ('select * from table where col = ''col''')
However, most database libraries provide bind parameters so you don't need to care about these details:
INSERT INTO foo (sql) VALUES (:sql)
... and then you assign a value to :sql.
Don't store SQL statements in a database!!
Store SQL Views in a database. Put them in a schema if you have to make them cleaner. There is nothing good that will happen ever if you store SQL Statements in a database, short of logging this is categorically a bad idea.
Also if you're using 10g, and you must do this: do it right! Per the FAQ
Use the 10g Quoting mechanism:
Syntax
q'[QUOTE_CHAR]Text[QUOTE_CHAR]'
Make sure that the QUOTE_CHAR doesnt exist in the text.
SELECT q'{This is Orafaq's 'quoted' text field}' FROM DUAL;