All Known Implementing Classes:

SqlAbstractConformance, SqlConformanceEnum, SqlDelegatingConformance
```
public interface SqlConformance
```
Enumeration of valid SQL compatibility modes.
For most purposes, one of the built-in compatibility modes in enum SqlConformanceEnum will suffice.
If you wish to implement this interface to build your own conformance, we strongly recommend that you extend SqlAbstractConformance, or use a SqlDelegatingConformance, so that you won't be broken by future changes.

See Also:

SqlConformanceEnum, SqlAbstractConformance, SqlDelegatingConformance

Field Summary

Fields
Modifier and Type	Field	Description
`static SqlConformanceEnum`	`DEFAULT`	Deprecated.
`static SqlConformanceEnum`	`ORACLE_10`	Deprecated.
`static SqlConformanceEnum`	`PRAGMATIC_2003`	Deprecated.
`static SqlConformanceEnum`	`PRAGMATIC_99`	Deprecated.
`static SqlConformanceEnum`	`STRICT_2003`	Deprecated.
`static SqlConformanceEnum`	`STRICT_92`	Deprecated.
`static SqlConformanceEnum`	`STRICT_99`	Deprecated.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`allowExplicitRowValueConstructor()`	Whether to allow SQL syntax "`ROW(expr1, expr2, expr3)`".
`boolean`	`allowExtend()`	Whether to allow mixing table columns with extended columns in `INSERT` (or `UPSERT`).
`boolean`	`allowExtendedTrim()`	Whether TRIM should support more than one trim character.
`boolean`	`allowGeometry()`	Whether to allow geo-spatial extensions, including the GEOMETRY type.
`boolean`	`allowNiladicParentheses()`	Whether to allow parentheses to be specified in calls to niladic functions and procedures (that is, functions and procedures with no parameters).
`boolean`	`isApplyAllowed()`	Whether `CROSS APPLY` and `OUTER APPLY` operators are allowed in the parser.
`boolean`	`isBangEqualAllowed()`	Whether the bang-equal token != is allowed as an alternative to <> in the parser.
`boolean`	`isFromRequired()`	Whether `FROM` clause is required in a `SELECT` statement.
`boolean`	`isGroupByAlias()`	Whether to allow aliases from the `SELECT` clause to be used as column names in the `GROUP BY` clause.
`boolean`	`isGroupByOrdinal()`	Whether `GROUP BY 2` is interpreted to mean 'group by the 2nd column in the select list'.
`boolean`	`isHavingAlias()`	Whether to allow aliases from the `SELECT` clause to be used as column names in the `HAVING` clause.
`boolean`	`isInsertSubsetColumnsAllowed()`	Whether to allow `INSERT` (or `UPSERT`) with no column list but fewer values than the target table.
`boolean`	`isLiberal()`	Whether this dialect supports features from a wide variety of dialects.
`boolean`	`isLimitStartCountAllowed()`	Whether to allow the SQL syntax "`LIMIT start, count`".
`boolean`	`isMinusAllowed()`	Whether `MINUS` is allowed as an alternative to `EXCEPT` in the parser.
`boolean`	`isPercentRemainderAllowed()`	Whether the "%" operator is allowed by the parser as an alternative to the `mod` function.
`boolean`	`isSortByAlias()`	Whether '`ORDER BY x`' is interpreted to mean 'sort by the select list item whose alias is x' even if there is a column called x.
`boolean`	`isSortByAliasObscures()`	Whether "empno" is invalid in "select empno as x from emp order by empno" because the alias "x" obscures it.
`boolean`	`isSortByOrdinal()`	Whether '`ORDER BY 2`' is interpreted to mean 'sort by the 2nd column in the select list'.
`boolean`	`shouldConvertRaggedUnionTypesToVarying()`	Whether the least restrictive type of a number of CHAR types of different lengths should be a VARCHAR type.

- Field Detail
  - DEFAULT
```
@Deprecated
static final SqlConformanceEnum DEFAULT
```
    Deprecated.
    
    Short-cut for SqlConformanceEnum.DEFAULT.
  - STRICT_92
```
@Deprecated
static final SqlConformanceEnum STRICT_92
```
    Deprecated.
    
    Short-cut for SqlConformanceEnum.STRICT_92.
  - STRICT_99
```
@Deprecated
static final SqlConformanceEnum STRICT_99
```
    Deprecated.
    
    Short-cut for SqlConformanceEnum.STRICT_99.
  - PRAGMATIC_99
```
@Deprecated
static final SqlConformanceEnum PRAGMATIC_99
```
    Deprecated.
    
    Short-cut for SqlConformanceEnum.PRAGMATIC_99.
  - ORACLE_10
```
@Deprecated
static final SqlConformanceEnum ORACLE_10
```
    Deprecated.
    
    Short-cut for SqlConformanceEnum.ORACLE_10.
  - STRICT_2003
```
@Deprecated
static final SqlConformanceEnum STRICT_2003
```
    Deprecated.
    
    Short-cut for SqlConformanceEnum.STRICT_2003.
  - PRAGMATIC_2003
```
@Deprecated
static final SqlConformanceEnum PRAGMATIC_2003
```
    Deprecated.
    
    Short-cut for SqlConformanceEnum.PRAGMATIC_2003.
- Method Detail
  - isLiberal
```
boolean isLiberal()
```
    Whether this dialect supports features from a wide variety of dialects. This is enabled for the Babel parser, disabled otherwise.
  - isGroupByAlias
```
boolean isGroupByAlias()
```
    Whether to allow aliases from the SELECT clause to be used as column names in the GROUP BY clause.
    Among the built-in conformance levels, true in SqlConformanceEnum.BABEL, SqlConformanceEnum.LENIENT, SqlConformanceEnum.MYSQL_5; false otherwise.
  - isGroupByOrdinal
```
boolean isGroupByOrdinal()
```
    Whether GROUP BY 2 is interpreted to mean 'group by the 2nd column in the select list'.
    Among the built-in conformance levels, true in SqlConformanceEnum.BABEL, SqlConformanceEnum.LENIENT, SqlConformanceEnum.MYSQL_5; false otherwise.
  - isHavingAlias
```
boolean isHavingAlias()
```
    Whether to allow aliases from the SELECT clause to be used as column names in the HAVING clause.
    Among the built-in conformance levels, true in SqlConformanceEnum.BABEL, SqlConformanceEnum.LENIENT, SqlConformanceEnum.MYSQL_5; false otherwise.
  - isSortByOrdinal
```
boolean isSortByOrdinal()
```
    Whether 'ORDER BY 2' is interpreted to mean 'sort by the 2nd column in the select list'.
    Among the built-in conformance levels, true in SqlConformanceEnum.DEFAULT, SqlConformanceEnum.BABEL, SqlConformanceEnum.LENIENT, SqlConformanceEnum.MYSQL_5, SqlConformanceEnum.ORACLE_10, SqlConformanceEnum.ORACLE_12, SqlConformanceEnum.STRICT_92, SqlConformanceEnum.PRAGMATIC_99, SqlConformanceEnum.PRAGMATIC_2003; SqlConformanceEnum.SQL_SERVER_2008; false otherwise.
  - isSortByAlias
```
boolean isSortByAlias()
```
    Whether 'ORDER BY x' is interpreted to mean 'sort by the select list item whose alias is x' even if there is a column called x.
    Among the built-in conformance levels, true in SqlConformanceEnum.DEFAULT, SqlConformanceEnum.BABEL, SqlConformanceEnum.LENIENT, SqlConformanceEnum.MYSQL_5, SqlConformanceEnum.ORACLE_10, SqlConformanceEnum.ORACLE_12, SqlConformanceEnum.STRICT_92; SqlConformanceEnum.SQL_SERVER_2008; false otherwise.
  - isSortByAliasObscures
```
boolean isSortByAliasObscures()
```
    Whether "empno" is invalid in "select empno as x from emp order by empno" because the alias "x" obscures it.
    Among the built-in conformance levels, true in SqlConformanceEnum.STRICT_92; false otherwise.
  - isFromRequired
```
boolean isFromRequired()
```
    Whether FROM clause is required in a SELECT statement.
    Among the built-in conformance levels, true in SqlConformanceEnum.ORACLE_10, SqlConformanceEnum.ORACLE_12, SqlConformanceEnum.STRICT_92, SqlConformanceEnum.STRICT_99, SqlConformanceEnum.STRICT_2003; false otherwise.
  - isBangEqualAllowed
```
boolean isBangEqualAllowed()
```
    Whether the bang-equal token != is allowed as an alternative to <> in the parser.
    Among the built-in conformance levels, true in SqlConformanceEnum.BABEL, SqlConformanceEnum.LENIENT, SqlConformanceEnum.MYSQL_5, SqlConformanceEnum.ORACLE_10; SqlConformanceEnum.ORACLE_12; false otherwise.
  - isPercentRemainderAllowed
```
boolean isPercentRemainderAllowed()
```
    Whether the "%" operator is allowed by the parser as an alternative to the mod function.
    Among the built-in conformance levels, true in SqlConformanceEnum.BABEL, SqlConformanceEnum.LENIENT, SqlConformanceEnum.MYSQL_5; false otherwise.
  - isMinusAllowed
```
boolean isMinusAllowed()
```
    Whether MINUS is allowed as an alternative to EXCEPT in the parser.
    Among the built-in conformance levels, true in SqlConformanceEnum.BABEL, SqlConformanceEnum.LENIENT, SqlConformanceEnum.ORACLE_10; SqlConformanceEnum.ORACLE_12; false otherwise.
    Note: MySQL does not support MINUS or EXCEPT (as of version 5.5).
  - isApplyAllowed
```
boolean isApplyAllowed()
```
    Whether CROSS APPLY and OUTER APPLY operators are allowed in the parser.
    APPLY invokes a table-valued function for each row returned by a table expression. It is syntactic sugar:
    
    SELECT * FROM emp CROSS APPLY TABLE(promote(empno)
    is equivalent to
    SELECT * FROM emp CROSS JOIN LATERAL TABLE(promote(empno)
    SELECT * FROM emp OUTER APPLY TABLE(promote(empno)
    is equivalent to
    SELECT * FROM emp LEFT JOIN LATERAL TABLE(promote(empno) ON true
    
    Among the built-in conformance levels, true in SqlConformanceEnum.BABEL, SqlConformanceEnum.LENIENT, SqlConformanceEnum.SQL_SERVER_2008; SqlConformanceEnum.ORACLE_12; false otherwise.
  - isInsertSubsetColumnsAllowed
```
boolean isInsertSubsetColumnsAllowed()
```
    Whether to allow INSERT (or UPSERT) with no column list but fewer values than the target table.
    The N values provided are assumed to match the first N columns of the table, and for each of the remaining columns, the default value of the column is used. It is an error if any of these columns has no default value.
    The default value of a column is specified by the DEFAULT clause in the CREATE TABLE statement, or is NULL if the column is not declared NOT NULL.
    Among the built-in conformance levels, true in SqlConformanceEnum.BABEL, SqlConformanceEnum.LENIENT, SqlConformanceEnum.PRAGMATIC_99, SqlConformanceEnum.PRAGMATIC_2003; false otherwise.
  - allowNiladicParentheses
```
boolean allowNiladicParentheses()
```
    Whether to allow parentheses to be specified in calls to niladic functions and procedures (that is, functions and procedures with no parameters).
    For example, CURRENT_DATE is a niladic system function. In standard SQL it must be invoked without parentheses:
    VALUES CURRENT_DATE
    
    If allowNiladicParentheses, the following syntax is also valid:
    VALUES CURRENT_DATE()
    
    Of the popular databases, MySQL, Apache Phoenix and VoltDB allow this behavior; Apache Hive, HSQLDB, IBM DB2, Microsoft SQL Server, Oracle, PostgreSQL do not.
    Among the built-in conformance levels, true in SqlConformanceEnum.BABEL, SqlConformanceEnum.LENIENT, SqlConformanceEnum.MYSQL_5; false otherwise.
  - allowExplicitRowValueConstructor
```
boolean allowExplicitRowValueConstructor()
```
    Whether to allow SQL syntax "ROW(expr1, expr2, expr3)".
    The equivalent syntax in standard SQL is "(expr1, expr2, expr3)".
    Standard SQL does not allow this because the type is not well-defined. However, PostgreSQL allows this behavior.
    Standard SQL allows row expressions in other contexts, for instance inside VALUES clause.
    Among the built-in conformance levels, true in SqlConformanceEnum.DEFAULT, SqlConformanceEnum.LENIENT; false otherwise.
  - allowExtend
```
boolean allowExtend()
```
    Whether to allow mixing table columns with extended columns in INSERT (or UPSERT).
    For example, suppose that the declaration of table T has columns A and B, and you want to insert data of column C INTEGER not present in the table declaration as an extended column. You can specify the columns in an INSERT statement as follows:
    INSERT INTO T (A, B, C INTEGER) VALUES (1, 2, 3)
    
    Among the built-in conformance levels, true in SqlConformanceEnum.BABEL, SqlConformanceEnum.LENIENT; false otherwise.
  - isLimitStartCountAllowed
```
boolean isLimitStartCountAllowed()
```
    Whether to allow the SQL syntax "LIMIT start, count".
    The equivalent syntax in standard SQL is "OFFSET start ROW FETCH FIRST count ROWS ONLY", and in PostgreSQL "LIMIT count OFFSET start".
    MySQL and CUBRID allow this behavior.
    Among the built-in conformance levels, true in SqlConformanceEnum.BABEL, SqlConformanceEnum.LENIENT, SqlConformanceEnum.MYSQL_5; false otherwise.
  - allowGeometry
```
boolean allowGeometry()
```
    Whether to allow geo-spatial extensions, including the GEOMETRY type.
    Among the built-in conformance levels, true in SqlConformanceEnum.BABEL, SqlConformanceEnum.LENIENT, SqlConformanceEnum.MYSQL_5, SqlConformanceEnum.SQL_SERVER_2008; false otherwise.
  - shouldConvertRaggedUnionTypesToVarying
```
boolean shouldConvertRaggedUnionTypesToVarying()
```
    Whether the least restrictive type of a number of CHAR types of different lengths should be a VARCHAR type. And similarly BINARY to VARBINARY.
    For example, consider the query
    SELECT 'abcde' UNION SELECT 'xyz'
    
    The input columns have types CHAR(5) and CHAR(3), and we need a result type that is large enough for both:
    
    Under strict SQL:2003 behavior, its column has type CHAR(5), and the value in the second row will have trailing spaces.
    With lenient behavior, its column has type VARCHAR(5), and the values have no trailing spaces.
    
    Among the built-in conformance levels, true in SqlConformanceEnum.PRAGMATIC_99, SqlConformanceEnum.PRAGMATIC_2003, SqlConformanceEnum.MYSQL_5; SqlConformanceEnum.ORACLE_10; SqlConformanceEnum.ORACLE_12; SqlConformanceEnum.SQL_SERVER_2008; false otherwise.
  - allowExtendedTrim
```
boolean allowExtendedTrim()
```
    Whether TRIM should support more than one trim character.
    For example, consider the query
    SELECT TRIM('eh' FROM 'hehe__hehe')
    
    Under strict behavior, if the length of trim character is not 1, TRIM throws an exception, and the query fails. However many implementations (in databases such as MySQL and SQL Server) trim all the characters, resulting in a return value of '__'.
    Among the built-in conformance levels, true in SqlConformanceEnum.BABEL, SqlConformanceEnum.LENIENT, SqlConformanceEnum.MYSQL_5, SqlConformanceEnum.SQL_SERVER_2008; false otherwise.

Interface SqlConformance

Field Summary

Method Summary

Field Detail

DEFAULT

STRICT_92

STRICT_99

PRAGMATIC_99

ORACLE_10

STRICT_2003

PRAGMATIC_2003

Method Detail

isLiberal

isGroupByAlias

isGroupByOrdinal

isHavingAlias

isSortByOrdinal

isSortByAlias

isSortByAliasObscures

isFromRequired

isBangEqualAllowed

isPercentRemainderAllowed

isMinusAllowed

isApplyAllowed

isInsertSubsetColumnsAllowed

allowNiladicParentheses

allowExplicitRowValueConstructor

allowExtend

isLimitStartCountAllowed

allowGeometry

shouldConvertRaggedUnionTypesToVarying

allowExtendedTrim