Questions tagged [string]
The string tag has no usage guidance.
91
questions
1
vote
1
answer
455
views
When does Oracle still treat empty strings as NULL?
I was looking for the difference between VARCHAR and VARCHAR2 and learned, among other things, that Oracle’s VARCHAR2 treats empty strings as NULL, or the other way round. Also, apparently I should be ...
- 2,789
0
votes
2
answers
235
views
How to convert getdate() stored as varchar to date
I have stored 'getdate()' as text in one of my column in a table. (It's a complicated scenario ,how I saved it)
Now when I select the field what I am getting is getdate() instead of the date . How can ...
- 89
1
vote
0
answers
28
views
How does mysql_real_escape_string() work?
I have to send some string (in C) as a query to MySQL, so i used mysql_real_escape_string() to escape some characters like \0 or \n:
#include <mysql/mysql.h>
int loginQuery(char *Nickname, char *...
- 11
2
votes
2
answers
808
views
How to use replace text function in a column using another table as a "lookup table" reference?
Here's some examples to show what I'm after. The source table (the one to have its string values changed):
| string |
|-----------------------|
| abc${hello}123 |
| def${yolo}321 ...
0
votes
1
answer
618
views
How to prevent CONCAT function adding space in Postgresql?
Postgresql-11
select tick_time, nano_secs,
concat( to_char(tick_time, 'MMDD HH24:MI:SS.US'),
to_char(nano_secs, '000') )
from ticks
order by tick_time, nano_secs limit 100;
I want to ...
- 315
0
votes
1
answer
1k
views
Cannot Insert it into in my table for Special characters when ANSI_WARNINGS is Off even with nvarchar
I want to insert a data row into my table as name: DSKWOR00 , but I get this error :
String or binary data would be truncated.
so I turned ANSI_WARNINGS OFF and it inserted the row but the result ...
0
votes
1
answer
390
views
Covert from literal HEX value to INT MariaDB
I have a situation where i need to get the integer value from a literal hex.
Example: "ff" equals 255 in decimal, but if i use the HEX("ff") function it returns 6666.
Is it ...
5
votes
1
answer
186
views
Match .csv values as INTs. If one value from a group in the .csv matches one in another group, then merge strings
Here we have two sets of numbers. The problem is that I can't figure out how to get from the input to the output of numbers (DDL and DML below and also in the fiddle here).
current_data
1,2,3
1,4
1,5,...
- 67
0
votes
2
answers
677
views
Indexing on a fixed-length string (10 characters - phone numbers) for a large number of entries (performance)?
I understand that a lot of similar questions have already been asked but I could not find a definitive answer for my question.
Briefly,
I have to authenticate users using a REST API, with their phone ...
- 9
0
votes
1
answer
1k
views
Calculating Average Value of JSONB array in Postgres
I have a column called "value" in my "answers" table.
| value |
|---------|
| [1,2] |
| [1] |
| [1,2,3] |
The type of "value" is "jsonb".
I want to get ...
user236222
7
votes
1
answer
1k
views
text column compares equal to where clause but does not select matching row
We are having trouble when querying a table in our production database. One text column will compare equal to a string we filter on in the where clause, but postgres will not select the row.
(We are ...
- 73
0
votes
1
answer
390
views
What exactly is the datatype input into a DATETIME value in MySQL
I am trying to get data from a PLC directly into a MySQL 8.0 database (using MySQL Workbench). I need to know what data type the input value is for a column set to DATETIME so I can send in the right ...
- 105
1
vote
2
answers
152
views
Replace specific part of a string
I've got a table with multiple columns, APGRPID, VIRTKEY, LFDNR and PARAMETERLIST. I want to change a part of some strings in the PARAMETERLIST column.
In the PARAMETERLIST I want to replace the "...
- 21
0
votes
2
answers
681
views
convert date in string format to date datatype sql [duplicate]
I have values in a column named Date as a nvarachar data type in the form of mmddyy and want to convert the values to a date datatype in the form of yyyy-mm-dd. What sql colde can I use to convert the ...
2
votes
2
answers
1k
views
WHERE Clause Compare VarChar(n) Column = VarChar(MAX) Variable Results in Inequality Comparison and Poor Query Performance
Earlier today I was working on a Reporting Stored Procedure which had poor performance. I was able to fix the issue by changing a static variable which held a string of ten characters or less from ...
- 1,031
0
votes
1
answer
137
views
Levenshtein function returning different result based on limit value
The Levenshtein function is not working as I would have expect. Is there anything that I minsunderstood?
Here is the query:
SELECT c0.id, c0.engine_type, c0.mpg, c0.kwh, c0.price, c0.make, c0.model, ...
- 375
1
vote
1
answer
2k
views
How to write correct array string parameter for mysql query?
I'm trying to put up a correct string to pass as a parameter to a simple query.
Correct query that returns records:
SELECT id_s FROM group_of_id_s
WHERE date IN ('2020-08-01','2020-08-01','2020-08-02',...
- 77
2
votes
1
answer
35
views
Performing SQL string manipulations on a single column
I recently came across a problem at an interview which I wasn't able to answer. The ask was to write some SQL fetch the first three number(s) after crossing two 2 decimals.
For example:
Input table:
...
- 27
0
votes
1
answer
74
views
String index for a list of values using IN($1,$2): will a btree index work?
We have a query that needs to compare a value to a list of values in a where clause. The strings are known and discrete. Does IN use the = operator to compare values? Would a b-tree index work for ...
- 103
1
vote
1
answer
466
views
Count numbers in scientific notation (E-notation)
I'm trying to check if a part number field has scientific notation values and came up with this simple solution:
SELECT count(*) as overall,
count(*) filter (where partnumber ilike '%E+%') as ...
- 141
0
votes
1
answer
735
views
Mongodb index keeps growing in size eventhough the collection has a TTL index
I work on a mongodb sharded cluster (3.0.2 i know it's very outdated, not my call), on which i have a sharded db and a sharded collection on which i have multiple indexes.
One of the indexes is a TTL ...
- 101
0
votes
1
answer
174
views
How do I send an array of strings to PG from PHP without the former becoming confused?
I want to do this, but for more than one string:
SELECT * FROM table WHERE label <> $1
That selects all records from table where the label column is different from a single string. It works.
...
user212833
3
votes
1
answer
3k
views
Is there some function in PostgreSQL to simply check if the input string is valid UTF-8 according to PG?
For several years now, I've been hunting this extremely quick-footed little bug which knows every hiding place in my metaphorical coding house. He lurks in the walls, sometimes takes months to show ...
- 31
2
votes
1
answer
4k
views
character varying vs. text as function parameter types in PostgreSQL
Is there any significant difference (in performance for example) between character varying vs. text as types for db function parameters? I have 2 usage examples:
Example 1:
CREATE OR REPLACE ...
- 397
2
votes
1
answer
2k
views
How to output string values in single quotes?
I'm trying to convert values stored in a json into its string representation.
The #>> operator works for this purpose for numbers, e.g.:
SELECT '{"a":[1,2,3],"b":["4","5","6"]}'::json#>>'...
- 3,425
0
votes
1
answer
99
views
How do you combine the input of three parameters into one?
I'm working on a query that will run via C# to SQL server. I'm trying to make the query flexible and provide parameters for all the inputs.
Here is the query:
SELECT
Test_Matrix.tblTestMatrix....
- 13
2
votes
1
answer
313
views
Prefix scale for UTL_MATCH.JARO_WINKLER_SIMILARITY
This is a repeat of a previous question from several years ago that did not receive an answer.
Oracle has a string matching package, UTL_MATCH, which contains the subprogram JARO_WINKLER_SIMILARITY.
...
- 21
1
vote
3
answers
3k
views
Is there a more concise way in Postgres to extract a portion of a string?
I'm using Postgres 9.5. I have a table with a column that records URLs. Sometimes the URL has a query string and sometimes it does not. I would like to extract the URL, minus any query string, so I ...
- 643
3
votes
1
answer
812
views
reverse the characters of a string without changing the position of the numeric value in T-SQL
With T-SQL, I'm trying to find the easiest way to reverse the characters of a string without changing the position of the numeric value.
So for string:
abc223de11
have
edc223ba11
- 41
0
votes
1
answer
263
views
SQL Server 2017 - Extracting source and target column names within a string containing column mappings
I have the following format string stored in text (could be any number of columns):
col1_source|col1_target;col2_source|col2_target;col3_source|col3_target;...
I'm trying to come up with an ...
- 13
0
votes
2
answers
66
views
How to chop off X number of characters across multiple records?
Hello all!
I have a field that contains geographical locations in the city-state format:
Boston, MA
Los Angeles, CA
Helena, MT
...
The field spans for some 230 records. My task is to chop off the ...
1
vote
2
answers
882
views
SELECT i.c.w. a COUNT and INNER JOIN gives different results with string literals and numeric values when they are used in a WHERE clause
I have a MySQL query:
SELECT
p.informationProvider as pGLN,
p.productID,
p.productStatus
FROM tblproducts AS p
WHERE
-- informationProvider is of type varchar(14)
p....
- 452
-2
votes
2
answers
535
views
How to convert a multi-row result set into a single-row text separated by commas
I'm using this query
select Name, valueType from mytable where ID = 1
and getting this table:
But I need to covert the result set into something like:
'idGasto int, noTicket string, fechaFact ...
4
votes
2
answers
1k
views
String comparison without CASE statements?
Is there a shorter more terse way to do a string comparison in SQL Server without wrapping it in a CASE WHEN ... THEN 1 END? In PostgreSQL, I can do
SELECT c, c='foo'
FROM ( VALUES ('foo'),('bar') ) ...
- 62.2k
2
votes
1
answer
746
views
Is there any string compaction option for PostgreSQL?
I have a table like this:
CREATE TABLE BLOG(
CATEGORY CHAR(32)
);
Category is a column, which stored enum values.
For example, I have 1 millions of rows and 10 unique values of Category.
Let'...
- 123
12
votes
2
answers
18k
views
Conditional string concatenation in PostgreSQL
I have a table parcels which currently contains the columns owner_addr1, owner_addr2, owner_addr3. Sometimes, one or both of the latter two fields is empty. I want to combine them into a single new ...
- 379
0
votes
1
answer
558
views
MariaDB are bitwise operators defined on strings?
Is the behavior of BITAND, (bitwise and) defined in MariaDB over strings?
SELECT '0011' & '0011', 'ff' & 'ff', 'yy' & 'YY', '5' & '5';
+-----------------+-------------+-------------+--...
- 62.2k
1
vote
1
answer
731
views
Does a Levenshtein distance involve some computation for each single row?
Let's say I have, in a SQL DB, a table with 2 columns: id integer, description text and 100,000 rows. The column description has always < 20 characters.
If I want to:
SELECT * FROM mytable WHERE ...
- 161
13
votes
4
answers
67k
views
Find if any of the rows partially match a string
I want to see if a table contains any sub-string of a given string.
Let's say I have a string
somedomain.com
In database I have:
blabladomain.com
testdomain.com
domain.com
I need to make a ...
- 263
3
votes
1
answer
606
views
Test if a string is a valid, unquoted identifier?
I'm just wondering if there is an established method for testing if a string can be used as an unquoted PostgreSQL identifier? (unquoted because almost any string can be a quoted identifier).
I ask ...
- 3,425
0
votes
1
answer
39
views
Value of columns inOracle tables
I have many schemas in one oracle databse named SCHEMA1, SCHEMA2...SCHEMA999
I want to find specific value of column named "JN_OSUSER" which is string 'Ed.Spencer'
How to find in every table, in ...
0
votes
0
answers
45
views
Storing a lot of text / string data strategies - analysis and solution
I have a LOB application backed by SQL Server 2016.
Over the past few weeks, theres been issues whereby the SQL Server start throwing timeout errors - which has led to a bit more digging into the ...
- 121
13
votes
2
answers
3k
views
Is there an efficient way to see the cause for "String or binary data would be truncated"?
This is a follow-up on this question. It is also related to this feature request from Microsoft.
However, many years have passed and several major releases reached the market since it was reported.
...
- 1,261
5
votes
3
answers
4k
views
Equivalent to PostgreSQL's Dollar-quoted String Constants for SQL Server
Is there an equivalent of PostgreSQL's Dollar-quoted String Constants, on SQL Server?
I would like to enter HTML string literals that would potentially contain single or double quotes in them.
...
- 151
5
votes
2
answers
2k
views
Optimizing a Query for splitting strings with a known size
I have a Column that has a . as a delimiter, it looks like so....
abc.efg.hij
I want a query that turns this into three columns, Col1, Col2, and Col3. I am wondering what the fastest way to do this ...
- 153
1
vote
2
answers
468
views
SQL regex PostgreSQL
Let's consider a table like that:
id | name
1 | This is a test sentence
2 | is a sentence TeST
3 | This a IS test sentence
4 | iS a tEst sentence tHis
5 | This a test sentence is
How ...
- 15
8
votes
2
answers
13k
views
varchar(MAX) text cuts off while going more than 8000 characters inside a procedure
I have a procedure in which i have declared a variable with datatype varchar(MAX),
declare @str varchar(MAX);
set @str='select * from Table1...'
print (@str);
exec (@str);
but when the text ...
2
votes
1
answer
1k
views
How do you unescape "C-like backslash escape sequence" that come from a function?
This will unescape the \n\n sequence.
SELECT E'\n\nFOO';
But if that same sequence comes from a function, what do you do.
CREATE FUNCTION asdf() RETURNS text
AS $$
SELECT '\n\nFOO'::text
$$ ...
- 62.2k
6
votes
5
answers
3k
views
PostgreSQL: how can I shorten a multi-word string to few words?
I'm using PostgreSQL 9.5.6. I have space separated multi-word strings that I need to shorten to say 3 words?
I've looked at the documentation and in order to use the substring() functions I need to ...
- 95
4
votes
2
answers
22k
views
Is there an easy way in PostgreSQL to escape newlines, carriage returns, and tabs?
Let's say I want to escape these to see a similar string
SELECT *
FROM ( VALUES
(E'\r\n\t FOO BAR \t\n\r')
) AS t(str);
How do I get the c-style escapes, \r\n\t FOO BAR \t\n\r back out?
SELECT *
...
- 62.2k