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| Characteristics | CHAR | C STRING | VARCHAR | CLOB |
|---|---|---|---|---|
Datatype Characteristics |
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| Character data allowed | Y | Y | Y | Y |
| Binary data allowed | N | N | N | N |
| Embedded nulls allowed | N | N | Y | Y |
| Null-terminated | N | Y | N | N |
| Data_lengths required | N | N | Y | Y |
| Max size | 4,095 | 64mb | 4,095 | 64mb |
Usage Characteristics |
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| Select item of simple query | Y | Y | Y | Y |
| Select item of outer query | Y | Y | Y | Y |
| Select item of nested query | Y | Y | Y | N |
| Select item of INSERT | Y | Y | Y | N |
| Select item of set operation | Y | Y | Y | Y |
| Table joins | Y | Y | Y | N |
| WHERE clause | Y | Y | Y | Limited 1 |
| GROUP BY clause | Y | Y | Y | N |
| ORDER BY clause | Y | Y | Y | N |
| HAVING clause | Y | Y | Y | N |
| SELECT INTO clause | Y | Y | Y | N |
| Aggregate functions | Y | Y | Y | N |
| SQL Functions | Y | Y | Y | Limited 2 |
Update Characteristics |
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| Inserts, updates and deletes | Y | Y | Y | N |
| ————————————————————————– | —————- | —————- | —————- | —————- |
1. Limited to use of LIKE, $CONTAINS and IS NULL operators.
2.See individual functions for compatibility with CLOB datatype.
See also: