1. Click table name in left tree.
2. Click the “Edit” button.
3. then will show “Edit Table” form, select the field you want to edit in “Columns” list.
4. Then you can change the “Type”, here is from “CLOB” to “NCLOB”.
Click “OK”. Done!
Oracle → SQL reference
Type mapping
| Value kind | in Oracle | in SQL |
|---|---|---|
| Int | NUMBER(10) | INT |
| Bigint | NUMBER(19) | BIGINT |
| Decimal | NUMBER(p,s) | DECIMAL(p,s) |
| Float | BINARY_DOUBLE | DOUBLE PRECISION |
| Text | VARCHAR2(n) | VARCHAR(n) |
| Long text | CLOB | TEXT / CLOB |
| Binary | BLOB | BLOB / BYTEA |
| Boolean | NUMBER(1) | BOOLEAN / SMALLINT |
| JSON | CLOB | JSON / TEXT |
Dialect differences
Oracle is a database server and SQL is a file format, so the gap is wider than a dialect difference - the rows below are where values and structure stop lining up.
| Property | in Oracle | in SQL |
|---|---|---|
| port | 1521 | — |
| identifiers | "double quotes" | Two competing conventions: single-quoted literals and diale... |
| row limit | FETCH FIRST n ROWS ONLY | — |
| dates | DATE, TIMESTAMP | Depends on the dialect: DATE literals, TO_DATE(), or plain ... |
| long text | CLOB, NCLOB | — |
| binary | BLOB, BFILE | Dialect-specific: X-quoted literal, 0x hex, or decode() |
| separator | — | Statement terminators (;) |
| encoding | — | No declaration |
| typing | — | Types belong to the target database, and they differ betwee... |
| shape | Tables of rows and columns | Statements; a dump usually means CREATE TABLE plus INSERT rows |
| ceiling | — | No formal limit, but a single INSERT statement has to fit i... |
Command line
| Side | Command |
|---|---|
| Oracle | exp / expdp |
| Oracle (load) | sqlldr (SQL*Loader) |
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