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Overview
| Comment: | Fix a problem with the definition of the DEFAULT clause on lang_conflict.html. |
|---|---|
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
73b4c1e498271d874b5b6a97c262690b |
| User & Date: | dan 2010-09-29 18:22:09 |
Context
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2010-09-30
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| 16:15 | Added a syntax diagram for numeric literals, especially floating point literals. check-in: 598ff451ef user: drh tags: trunk | |
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2010-09-29
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| 18:22 | Fix a problem with the definition of the DEFAULT clause on lang_conflict.html. check-in: 73b4c1e498 user: dan tags: trunk | |
| 11:10 | Change "'CREATE TABLE AS' statements" to "'CREATE TABLE ... AS SELECT ...' statements" on lang_createtable.html. check-in: 4534ea5789 user: dan tags: trunk | |
Changes
Changes to pages/lang.in.
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rows of data returned by the SELECT statement. ^Rows are assigned contiguously
ascending [rowid] values, starting with 1, in the [order by|order] that they
are returned by the SELECT statement.
<tcl>hd_fragment {tablecoldef} {column definition} {column definitions}</tcl>
<h3>Column Definitions</h3>
<p>Unless it is a CREATE TABLE AS statement, a CREATE TABLE includes one or
more [column-def|column definitions], optionally followed by a list of
[table-constraint|table constraints]. Each column definition consists of the
name of the column, optionally followed by the declared type of the column,
then one or more optional [column-constraint|column constraints]. Included in
the definition of "column constraints" for the purposes of the previous
statement are the COLLATE and DEFAULT clauses, even though these are not really
constraints in the sense that they do not restrict the data that the table may
contain. The other constraints - NOT NULL, CHECK, UNIQUE, PRIMARY KEY and
................................................................................
determine the [affinity] of the column only.
<p>The DEFAULT clause specifies a default value to use for the column if no
value is explicitly provided by the user when doing an [INSERT]. ^If there
is no explicit DEFAULT clause attached to a column definition, then the
default value of the column is NULL. ^(An explicit DEFAULT clause may specify
that the default value is NULL, a string constant, a blob constant, a
signed-number, or an arbitrary expression enclosed in parentheses. An explicit
default value may also be one of the special case-independent keywords
CURRENT_TIME, CURRENT_DATE or CURRENT_TIMESTAMP.)^
<p>^(Each time a row is inserted into the table by an INSERT statement that
does not provide explicit values for all table columns the values stored in
the new row are determined by their default values)^, as follows:
<ul>
<li><p>^If the default value of the column is a constant NULL, text, blob or
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728
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rows of data returned by the SELECT statement. ^Rows are assigned contiguously
ascending [rowid] values, starting with 1, in the [order by|order] that they
are returned by the SELECT statement.
<tcl>hd_fragment {tablecoldef} {column definition} {column definitions}</tcl>
<h3>Column Definitions</h3>
<p>Unless it is a CREATE TABLE ... AS SELECT statement, a CREATE TABLE includes
one or more [column-def|column definitions], optionally followed by a list of
[table-constraint|table constraints]. Each column definition consists of the
name of the column, optionally followed by the declared type of the column,
then one or more optional [column-constraint|column constraints]. Included in
the definition of "column constraints" for the purposes of the previous
statement are the COLLATE and DEFAULT clauses, even though these are not really
constraints in the sense that they do not restrict the data that the table may
contain. The other constraints - NOT NULL, CHECK, UNIQUE, PRIMARY KEY and
................................................................................
determine the [affinity] of the column only.
<p>The DEFAULT clause specifies a default value to use for the column if no
value is explicitly provided by the user when doing an [INSERT]. ^If there
is no explicit DEFAULT clause attached to a column definition, then the
default value of the column is NULL. ^(An explicit DEFAULT clause may specify
that the default value is NULL, a string constant, a blob constant, a
signed-number, or any constant expression enclosed in parentheses. An explicit
default value may also be one of the special case-independent keywords
CURRENT_TIME, CURRENT_DATE or CURRENT_TIMESTAMP.)^ ^For the purposes of the
DEFAULT clause, an expression is considered constant provided that it does
not contain any sub-queries or string constants enclosed in double quotes.
<p>^(Each time a row is inserted into the table by an INSERT statement that
does not provide explicit values for all table columns the values stored in
the new row are determined by their default values)^, as follows:
<ul>
<li><p>^If the default value of the column is a constant NULL, text, blob or
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