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SQL ServerGetting Started

Count the rows in a table

SQL Server: COUNT(*) includes every row, including rows with NULL columns.

SQL Server✓ Tested
Linux CommandsFiles & folders

Create a directory tree

Create a directory and its missing parent directories. The -p option also succeeds when the directories already exist.

directory✓ Tested
HTMLData & disclosure

Create a native disclosure

Use details and summary to show optional HTML content without JavaScript.

HTML✓ Tested
SQLGetting Started

Create a table and insert its first row

SQL: Define column types and a primary key, then insert one row using an explicit column list.

SQL✓ Tested
SQL ServerGetting Started

Create a table and insert its first row

SQL Server: Define column types and a primary key, then insert one row using an explicit column list.

SQL Server✓ Tested
SQLSchema design & transactions

Create an index for an equality filter

SQL: A nonunique index can support lookups on a frequently filtered column.

SQL✓ Tested
SQL ServerSchema design & transactions

Create an index for an equality filter

SQL Server: A nonunique index can support lookups on a frequently filtered column.

SQL Server✓ Tested
PostgresSchema design & transactions

Create an index for an equality filter

Postgres: A nonunique index can support lookups on a frequently filtered column.

Postgres✓ Tested
SQLiteSchema design & transactions

Create an index for an equality filter

SQLite: A nonunique index can support lookups on a frequently filtered column.

SQLite✓ Tested
SQLSchema design & transactions

Create an index matching filter and ordering columns

SQL: Place the equality-filter column before the ordering column in this composite index.

SQL✓ Tested
SQL ServerSchema design & transactions

Create an index matching filter and ordering columns

SQL Server: Place the equality-filter column before the ordering column in this composite index.

SQL Server✓ Tested
PostgresSchema design & transactions

Create an index matching filter and ordering columns

Postgres: Place the equality-filter column before the ordering column in this composite index.

Postgres✓ Tested