Results for “Context & shared state”
Small, practical examples. Search by task or narrow things down below.
Return zero for a sum over no rows
SQLite: SUM produces NULL for an empty input; COALESCE supplies the desired reporting default.
SQLite✓ Tested
Run cleanup after an AJAX failure
jQuery: always runs on success or failure and can clear loading state.
jQuery✓ Tested
Search for a literal LIKE wildcard
SQL: Declare an escape character so a percent sign in the pattern is literal.
SQL✓ Tested
Search for a literal LIKE wildcard
SQL Server: Declare an escape character so a percent sign in the pattern is literal.
SQL Server✓ Tested
Search for a literal LIKE wildcard
Postgres: Declare an escape character so a percent sign in the pattern is literal.
Postgres✓ Tested
Search for a literal LIKE wildcard
SQLite: Declare an escape character so a percent sign in the pattern is literal.
SQLite✓ Tested
Select an inclusive range
Find rows with values between two endpoints.
BETWEEN✓ Tested
Select specific columns
Read only the fields a result needs.
SELECT✓ Tested
Select the top row in each group with a tie-breaker
SQL: Filter an outer query on ROW_NUMBER because window functions are not evaluated in WHERE.
SQL✓ Tested
Select the top row in each group with a tie-breaker
SQL Server: Filter an outer query on ROW_NUMBER because window functions are not evaluated in WHERE.
SQL Server✓ Tested
Select the top row in each group with a tie-breaker
Postgres: Filter an outer query on ROW_NUMBER because window functions are not evaluated in WHERE.
Postgres✓ Tested
Select the top row in each group with a tie-breaker
SQLite: Filter an outer query on ROW_NUMBER because window functions are not evaluated in WHERE.
SQLite✓ Tested