COUNT(*) vs COUNT(column) Are DIFFERENT?!
COUNT(*) and COUNT(column) behave completely differently with NULLs! One counts NULLs, one doesn't. This breaks aggregate logic! Watch!
#sql #sqltricks #database #sqltutorial #count #aggregate #sqlquiz #codingchallenge #sqlshorts #sqlbugs #nullhandling #sqlwtf
JOIN With NULL Keys Returns ZERO Rows?!
JOINing tables with NULL keys returns ZERO rows! NULL = NULL in JOIN is FALSE. This breaks all join logic! Watch!
#sql #sqltricks #database #sqltutorial #join #nullkeys #sqlquiz #codingchallenge #sqlshorts #sqlbugs #joins #sqlwtf
ROW_NUMBER() OVER (ORDER BY NULL) Does WHAT?!
ROW_NUMBER with ORDER BY NULL creates non-deterministic ordering! All rows get random numbers. This breaks window functions! Watch!
#sql #sqltricks #database #sqltutorial #rownumber #windowfunctions #sqlquiz #codingchallenge #sqlshorts #sqlbugs #ordering #sqlwtf
LEN('') vs LEN(NULL) vs LEN(' ') Are DIFFERENT?!
LEN of empty string, NULL, and space are all different! Empty = 0, NULL = NULL, Space = 1. This breaks string length logic! Watch!
#sql #sqltricks #database #sqltutorial #len #stringlength #sqlquiz #codingchallenge #sqlshorts #sqlbugs #stringfunctions #sqlwtf
'10' + 5 In SQL Does WHAT?!
SQL implicit type conversion will shock you! Adding string '10' to number 5 creates something unexpected. This breaks type safety! Watch!
#sql #sqltricks #database #sqltutorial #typeconversion #implicitcast #sqlquiz #codingchallenge #sqlshorts #sqlbugs #typesafety #sqlwtf
10 % 0 Modulo By Zero Returns WHAT?!
Modulo by zero in SQL doesn't always crash! Some databases return NULL, others error. This breaks math operations! Watch the chaos!
#sql #sqltricks #database #sqltutorial #modulo #divisionbyzero #sqlquiz #codingchallenge #sqlshorts #sqlbugs #mathoperations #sqlwtf
NULL IN (1,2,3) Is NOT What You Think!
Your brain will explode! Checking if NULL is IN a list returns something that makes NO sense. This breaks every query! Watch the chaos!
#sql #sqltricks #database #sqltutorial #nullin #sqlquiz #codingchallenge #sqlshorts #sqlbugs #inclause #sqlwtf #threevaluedlogic
Three-Valued Logic: AND - OR With NULL?!
SQL has THREE truth values: TRUE, FALSE, and UNKNOWN (NULL)! AND/OR with NULL creates logic that breaks everything! Watch!
#sql #sqltricks #database #sqltutorial #threevaluedlogic #null #sqlquiz #codingchallenge #sqlshorts #sqlbugs #booleanlogic #sqlwtf
GROUP BY NULLs Are Treated As ONE?!
GROUP BY treats all NULLs as the same group! Multiple NULL rows get grouped together. This breaks grouping logic! Watch now!
#sql #sqltricks #database #sqltutorial #groupby #nullhandling #sqlquiz #codingchallenge #sqlshorts #sqlbugs #grouping #sqlwtf
NULL = NULL Is FALSE In SQL?!
STOP SCROLLING! Comparing NULL to NULL in SQL returns FALSE, not TRUE! This breaks every assumption about equality. Your mind will explode! Watch now!
#sql #sqltricks #database #sqltutorial #sqlweird #nullcomparison #sqlquiz #codingchallenge #sqlshorts #sqlwtf #databasequeries #sqlbugs
COALESCE(NULL, NULL, NULL) Returns WHAT?!
COALESCE with all NULLs returns something that defies logic! This function is supposed to return first non-NULL but what if all are NULL? Watch!
#sql #sqltricks #database #sqltutorial #coalesce #nullhandling #sqlquiz #codingchallenge #sqlshorts #sqlbugs #nullfunctions #sqlwtf
EXISTS vs IN With NULL Breaks Logic!
EXISTS and IN behave completely differently with NULL! One works, one doesn't. This breaks subquery logic! Watch the chaos!
#sql #sqltricks #database #sqltutorial #existsin #subqueries #sqlquiz #codingchallenge #sqlshorts #sqlbugs #nullhandling #sqlwtf
NULLIF(5, 5) Returns NULL?!
NULLIF with same values returns NULL instead of the value! This function behavior will break your brain. Watch the reveal!
#sql #sqltricks #database #sqltutorial #nullif #nullhandling #sqlquiz #codingchallenge #sqlshorts #sqlbugs #nullfunctions #sqlwtf
#SQL Avoid This Common Mistake With Nulls! #datascience #programming #coding
SQL Avoid This Common Mistake With Nulls! #datascience #programming #coding #sqltutorial SQL Shorts Playlist: ... source
https://quadexcel.com/wp/sql-avoid-this-common-mistake-with-nulls-datascience-programming-coding/
Empty String '' vs NULL Are DIFFERENT?!
SQL treats empty strings and NULL completely differently! This hidden difference breaks string logic. Your mind will short-circuit! Watch!
#sql #sqltricks #database #sqltutorial #emptystring #null #sqlquiz #codingchallenge #sqlshorts #sqlbugs #stringcomparison #sqlwtf
ORDER BY NULLs Go WHERE?!
ORDER BY with NULLs creates chaos! NULLs can go first or last depending on database. This breaks sorting logic! Watch!
#sql #sqltricks #database #sqltutorial #orderby #nullhandling #sqlquiz #codingchallenge #sqlshorts #sqlbugs #sorting #sqlwtf
SUM - AVG With Zero Rows Returns WHAT?!
Aggregate functions with zero rows return NULL, not zero! SUM of nothing is NULL, not 0. This breaks aggregate logic! Watch!
#sql #sqltricks #database #sqltutorial #aggregate #zerorows #sqlquiz #codingchallenge #sqlshorts #sqlbugs #aggregatefunctions #sqlwtf
CAST('ABC' AS INT) Crashes Or Returns NULL?!
CASTing non-numeric string to INT doesn't always error! Some databases return NULL, others crash. This breaks type safety! Watch!
#sql #sqltricks #database #sqltutorial #cast #stringtoint #sqlquiz #codingchallenge #sqlshorts #sqlbugs #typeconversion #sqlwtf
'Hello' = 'HELLO' Is TRUE Or FALSE?!
SQL string comparison case sensitivity depends on collation! Same strings can be equal or not. This breaks string matching! Watch!
#sql #sqltricks #database #sqltutorial #stringcomparison #casesensitivity #sqlquiz #codingchallenge #sqlshorts #sqlbugs #collation #sqlwtf
NULL In WHERE Clause Returns WHAT?!
STOP SCROLLING! Using NULL in WHERE clause creates something impossible! WHERE col = NULL returns ZERO rows. This breaks all logic! Watch now!
#sql #sqltricks #database #sqltutorial #nullwhere #sqlquiz #codingchallenge #sqlshorts #sqlbugs #whereclause #sqlwtf #hiddenbehavior
