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Bash ScriptsGetting Started

Replace text with parameter expansion

Bash Scripts: Replace text with parameter expansion with a small standalone Bash program.

Bash Scripts✓ Tested
Linux CommandsText processing

Replace text with sed

Replace all occurrences of the substring old on each line and print the transformed text without changing the input file.

sed✓ Tested
C++Strings

Replace the first match

Find and replace one literal substring in C++.

C++✓ Tested
SQLSubqueries & ranked selection

Report duplicate business values and their frequency

SQL: Group by a candidate business key and retain only groups with multiple rows.

SQL✓ Tested
SQL ServerSubqueries & ranked selection

Report duplicate business values and their frequency

SQL Server: Group by a candidate business key and retain only groups with multiple rows.

SQL Server✓ Tested
PostgresSubqueries & ranked selection

Report duplicate business values and their frequency

Postgres: Group by a candidate business key and retain only groups with multiple rows.

Postgres✓ Tested
SQLiteSubqueries & ranked selection

Report duplicate business values and their frequency

SQLite: Group by a candidate business key and retain only groups with multiple rows.

SQLite✓ Tested
ReactAsync work & status

Report partial success from multiple actions

Report partial success from multiple actions with a small React component and explicit browser behavior.

React✓ Tested
jQueryDeferred work & queues

Report progress before completion

jQuery: notify calls registered progress handlers while the deferred is pending.

jQuery✓ Tested
C++Ownership & optional values

Represent an absent result with optional

C++: value_or supplies a default without requiring a sentinel inside the value domain.

C++✓ Tested
SQLConstraints & defaults

Require a value with NOT NULL

SQL: Declare required fields at the database boundary, not only in application validation.

SQL✓ Tested
SQL ServerConstraints & defaults

Require a value with NOT NULL

SQL Server: Declare required fields at the database boundary, not only in application validation.

SQL Server✓ Tested