The snippet library.
Small, practical examples. Search by task or narrow things down below.
Combine text values with a separator
SQL: Use the concatenation operator supported by the selected SQL dialect.
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Match a known text prefix
SQL: A percent wildcard matches zero or more characters following the prefix.
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Measure the length of ordinary text
SQL: Use the engine’s text-length function; this ASCII example has no trailing spaces.
SQL✓ Tested
Normalize ASCII text to lowercase
SQL: LOWER is useful for display normalization; indexed case-insensitive search depends on the database collation and schema.
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Normalize ASCII text to uppercase
SQL: UPPER changes character case under the database’s text rules.
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Place missing values after known values portably
SQL: A CASE sort key controls NULL placement without relying on engine-specific defaults.
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Remove surrounding spaces from text
SQL: TRIM removes leading and trailing space characters by default.
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Replace a literal substring
SQL: REPLACE performs a literal replacement rather than a regular-expression substitution.
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Search for a literal LIKE wildcard
SQL: Declare an escape character so a percent sign in the pattern is literal.
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Treat an empty trimmed value as missing
SQL: NULLIF converts an empty string to NULL before a fallback is applied.
SQL✓ Tested