Difference between revisions of "CREATE CURSOR"
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The CREATE CURSOR command creates a temporary table with the specified name. Columns to be included in the table can be specified individually or details loaded from an existing array. | The CREATE CURSOR command creates a temporary table with the specified name. Columns to be included in the table can be specified individually or details loaded from an existing array. | ||
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!Keywords||Description | !Keywords||Description | ||
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|scale||The column's decimal places where required. | |scale||The column's decimal places where required. | ||
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− | |NULL | NOT NULL||Specifies whether this column can have NULL values. NULL allows NULL values, NOT NULL prohibits NULL values. | + | |valign="top"|NULL | NOT NULL||Specifies whether this column can have NULL values. NULL allows NULL values, NOT NULL prohibits NULL values. |
|- | |- | ||
− | |CHECK <expression>||Validation rule for the column. The <expression> must evaluate to true (.T.), valid value or false (.F.), invalid value. | + | |valign="top"|CHECK <expression>||Validation rule for the column. The <expression> must evaluate to true (.T.), valid value or false (.F.), invalid value. |
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− | |ERROR <text>||An optional error message, <text>, to be displayed when the CHECK <expression> validation fails. | + | |valign="top"|ERROR <text>||An optional error message, <text>, to be displayed when the CHECK <expression> validation fails. |
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|AUTOINC||Enables auto incrementing for the column | |AUTOINC||Enables auto incrementing for the column | ||
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|NEXTVALUE <NextValue>||The specified <NextValue> is the numeric start value for the auto incrementing. | |NEXTVALUE <NextValue>||The specified <NextValue> is the numeric start value for the auto incrementing. | ||
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− | |STEP <StepValue>||The specified <StepValue> determines the increment value. By default values are incremented by 1. | + | |valign="top"|STEP <StepValue>||The specified <StepValue> determines the increment value. By default values are incremented by 1. |
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|DEFAULT <expression>||The specified <expression> is used as the default value for the column. | |DEFAULT <expression>||The specified <expression> is used as the default value for the column. | ||
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|COLLATE <cCollateSequence>||The specified <cCollateSequence> is used as the index collating sequence. | |COLLATE <cCollateSequence>||The specified <cCollateSequence> is used as the index collating sequence. | ||
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− | |NOCPTRANS||Disables code page translation for character and memo columns. | + | |valign="top"|NOCPTRANS||Disables code page translation for character and memo columns. |
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− | |FROM ARRAY <array>||The table structure is taken from an existing array, whose name is specified in <array>. The array contents must be the column name, type, precision and scale for each column in the temporary table. | + | |valign="top"|FROM ARRAY <array>||The table structure is taken from an existing array, whose name is specified in <array>. The array contents must be the column name, type, precision and scale for each column in the temporary table. |
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Revision as of 12:11, 21 January 2013
Contents
Purpose
Creates a temporary table
Syntax
CREATE CURSOR <cursor>
[(<column> <datatype> [(<precision> [,<scale>])]
[NULL | NOT NULL]
[CHECK <expression> [ERROR <text>]]
[AUTOINC [NEXTVALUE <NextValue> [STEP <StepValue>]]]
[DEFAULT <expression>]
[UNIQUE [COLLATE <cCollateSequence>]]
[NOCPTRANS]
[, ...]]
| [FROM ARRAY <array>]
See Also
ALTER INDEX, ALTER TABLE, CREATE TABLE, CREATE INDEX, CREATE VIEW, DROP DATABASE, DROP INDEX, DROP TABLE, SELECT, USE
Description
The CREATE CURSOR command creates a temporary table with the specified name. Columns to be included in the table can be specified individually or details loaded from an existing array.
Keywords | Description |
---|---|
cursor | The name of the temporary table to be created. |
column | The name of the column to be created. |
datatype | The column's data type. |
precision | The width of the column where not fixed. |
scale | The column's decimal places where required. |
NULL | NOT NULL | Specifies whether this column can have NULL values. NULL allows NULL values, NOT NULL prohibits NULL values. |
CHECK <expression> | Validation rule for the column. The <expression> must evaluate to true (.T.), valid value or false (.F.), invalid value. |
ERROR <text> | An optional error message, <text>, to be displayed when the CHECK <expression> validation fails. |
AUTOINC | Enables auto incrementing for the column |
NEXTVALUE <NextValue> | The specified <NextValue> is the numeric start value for the auto incrementing. |
STEP <StepValue> | The specified <StepValue> determines the increment value. By default values are incremented by 1. |
DEFAULT <expression> | The specified <expression> is used as the default value for the column. |
UNIQUE | Creates a unique index on this column. |
COLLATE <cCollateSequence> | The specified <cCollateSequence> is used as the index collating sequence. |
NOCPTRANS | Disables code page translation for character and memo columns. |
FROM ARRAY <array> | The table structure is taken from an existing array, whose name is specified in <array>. The array contents must be the column name, type, precision and scale for each column in the temporary table. |
Example
CREATE CURSOR tempstaff (staff_no CHAR(6) NOT NULL UNIQUE, lastname CHAR(15) NOT NULL, firstname CHAR(10), hiredate DATE, location CHAR(15), supervisor CHAR(6), salary DECIMAL(6,0), picture VARBINARY, history LONG VARCHAR, commission DECIMAL(4,1));