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41 lines
1.5 KiB
Plaintext
41 lines
1.5 KiB
Plaintext
.pgaw:Help.f.t insert end "UPDATE" {bold} " changes the values of the columns specified for all rows which satisfy condition. Only the columns to be modified need appear as column.
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Array references use the same syntax found in SELECT. That is, either single array elements, a range of array elements or the entire array may be replaced with a single query.
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You must have write access to the table in order to modify it, as well as read access to any table whose values are mentioned in the WHERE condition.
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" {} "Synopsis" {bold} "
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" {} "
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UPDATE table SET column = expression \[, ...\]
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\[ FROM fromlist \]
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\[ WHERE condition \]
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" {code} "Usage" {bold} "
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" {} "
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--Change word \"Drama\" with \"Dramatic\" on column kind:
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--
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UPDATE films
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SET kind = 'Dramatic'
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WHERE kind = 'Drama';
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SELECT * FROM films WHERE kind = 'Dramatic' OR kind = 'Drama';
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code |title |did| date_prod|kind |len
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-----+-------------+---+----------+----------+------
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BL101|The Third Man|101|1949-12-23|Dramatic | 01:44
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P_302|Becket |103|1964-02-03|Dramatic | 02:28
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M_401|War and Peace|104|1967-02-12|Dramatic | 05:57
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T_601|Yojimbo |106|1961-06-16|Dramatic | 01:50
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DA101|Das Boot |110|1981-11-11|Dramatic | 02:29
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" {code} "Compatibility" {bold} "
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SQL92
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SQL92 defines a different syntax for positioned UPDATE statement:
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" {} "
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UPDATE table SET column = expression \[, ...\]
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WHERE CURRENT OF cursor
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" {code} "where cursor identifies an open cursor. "
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