Subquery Returns Multiple Rows In Comparison?!
Using subquery that returns multiple rows in = comparison crashes! SQL doesn't know which row to use. This breaks subqueries! Watch!
#sql #sqltricks #database #sqltutorial #subqueries #multiplerows #sqlquiz #codingchallenge #sqlshorts #sqlbugs #subqueryerrors #sqlwtf
0.1 + 0.2 In SQL = 0.30000000000000004?!
SQL floating point precision is broken! Adding 0.1 + 0.2 creates a number with precision errors. This breaks financial calculations! Watch!
#sql #sqltricks #database #sqltutorial #floatingpoint #precision #sqlquiz #codingchallenge #sqlshorts #sqlbugs #numericprecision #sqlwtf
HAVING Filters After GROUP BY?!
HAVING filters GROUPS, WHERE filters ROWS! HAVING runs after aggregation, WHERE runs before. This order matters and will break your logic!
#sql #sqltricks #having #where #groupby #sqlweird #sqlquiz #codingchallenge #sqlshorts #sqlwtf #aggregation #advancedsql
Window ORDER BY NULLS FIRST - LAST?!
NULLS FIRST and NULLS LAST change window function results! The order of NULLs matters in window functions. This subtle difference will cause bugs!
#sql #sqltricks #windowfunctions #nullsfirst #nullslast #sqlweird #sqlquiz #codingchallenge #sqlshorts #sqlwtf #nullhandling #advancedsql
Decimal Precision Rounds Numbers?!
DECIMAL precision ROUNDS values! Cast 1.999 to DECIMAL(5,2) and it becomes 2.00. This silent rounding will cause calculation errors!
#sql #sqltricks #decimal #precision #rounding #sqlweird #sqlquiz #codingchallenge #sqlshorts #sqlwtf #datatypes #advancedsql
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
TRIM with Different Characters?!
TRIM can remove ANY character! Not just spaces. LEADING, TRAILING, or BOTH. This flexible trimming will clean your data in unexpected ways!
#sql #sqltricks #trim #leading #trailing #sqlweird #sqlquiz #codingchallenge #sqlshorts #sqlwtf #stringfunctions #advancedsql
'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
CHAR vs VARCHAR Padding?!
CHAR PADS with spaces! VARCHAR doesn't. LENGTH() returns different values for same string in CHAR vs VARCHAR. This padding will break comparisons!
#sql #sqltricks #char #varchar #padding #sqlweird #sqlquiz #codingchallenge #sqlshorts #sqlwtf #stringtypes #advancedsql
Conditional Aggregation with CASE?!
CASE inside SUM creates conditional aggregation! You can sum only certain rows based on conditions. This conditional math will transform your data!
#sql #sqltricks #case #sum #conditionalaggregation #sqlweird #sqlquiz #codingchallenge #sqlshorts #sqlwtf #aggregation #advancedsql
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
