2023-05-01
130 reads
Design
Free PDF Booklet: 119 SQL Code Smells
Once you've done a number of SQL code-reviews, you'll be able to identify signs in the code that indicate all might not be well. These 'code smells' are coding styles that, while not bugs, suggest design problems with the code. In this PDF, Phil Factor's put together 119 of those code smells so you can see what to avoid and why.
2014-09-25
12,476 reads
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Question of the Day
STRING_AGG's behavior
Executing the following script (Sql Server 2022), you get the table t0 with 10 rows:
CREATE TABLE t0
( id INT PRIMARY KEY
, field1 VARCHAR(1000)
, field2 VARCHAR(MAX));
INSERT INTO t0
SELECT
gs.value
, REPLICATE ('X', 1000)
, REPLICATE ('Y', 1000)
FROM generate_series(1, 10, 1) gs;
GOWhat happens if you execute the following statements?
select STRING_AGG(field1, ';') within group (order by id) from t0;
select STRING_AGG(field2, ';') within group (order by id) from t0;