Caché Transact-SQL (TSQL) Migration Guide - InterSystems ...

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TSQL Commands3.1.2 DROP TABLEDeletes a table definition. You can delete a single table, or a comma-separated list of tables.You can delete both tables and temporary tables. DROP TABLE ignores a nonexistent temporarytable name and completes without error.3.1.3 CREATE INDEXCreates an index for a specified table or view. TSQL partially supports CREATE INDEXwith the following limitations:The following Transact-SQL features are parsed, but ignored:• The CLUSTERED/NONCLUSTERED keywords.• The ASC/DESC keywords.• All WITH clause index options.• The ON filegroup or IN dbspace-name clause.The following Transact-SQL features are not currently supported:• The VIRTUAL keyword.• Using a function name as an alternative to a column name.3.2 Data Management Statements3.2.1 DELETEDeletes rows of data from a table. Both DELETE and DELETE FROM are supported. Mostother options are supported, with the following exceptions:• FROM table hints• rowset functions• OPTION clause• join hints14 Caché Transact-SQL (TSQL) Migration Guide
• only very simple theta joins are supported (the FROM table clause is transformed intonested subqueries)• primary table hintsThe following table_hints are parsed but ignored: FASTFIRSTROW, HOLDINDEX,INDEX(name), NOLOCK, PAGLOCK, READCOMMITTED, READPAST, READUNCOM-MITTED, REPEATABLEREAD, ROWLOCK, SERIALIZABLE, SHARED, TABLOCK,TABLOCKX, UPDLOCK, XLOCK. Table hints can be optionally preceded by the WITHkeyword, and, if WITH is specified, optionally enclosed in parentheses. A list of table hintscan be separated by either commas or blank spaces.DELETE sets the @@ROWCOUNT system variable to the number of rows deleted, andthe @@IDENTITY system variable to the IDENTITY value of the last row deleted.3.2.2 INSERTInserts rows of data into a table. Most options are supported, with the following exceptions:• rowset functions• taking values from an execute-statement• DEFAULTThe following table_hints are parsed but ignored: FASTFIRSTROW, HOLDINDEX,INDEX(name), NOLOCK, PAGLOCK, READCOMMITTED, READPAST, READUNCOM-MITTED, REPEATABLEREAD, ROWLOCK, SERIALIZABLE, SHARED, TABLOCK,TABLOCKX, UPDLOCK, XLOCK. Table hints can be optionally preceded by the WITHkeyword, and, if WITH is specified, optionally enclosed in parentheses. A list of table hintscan be separated by either commas or blank spaces.INSERT sets the @@ROWCOUNT system variable to the number of rows inserted, and the@@IDENTITY system variable to the IDENTITY value of the last row inserted.3.2.3 UPDATEUpdates values of existing rows of data in a table. Most options are supported, with the followingexceptions:• rowset• OPTIONData Management StatementsCaché Transact-SQL (TSQL) Migration Guide 15
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Page 26 and 27: TSQL Commands3.6.5 CHECKPOINTThe CH
Page 28 and 29: TSQL Commands3.8.2 IMPORTASQUERYThi
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Page 34 and 35: TSQL FunctionsWhen expression is a
Page 36 and 37: TSQL Functions4.1.11 DATEADDDATEADD
Page 38 and 39: TSQL Functionsyyyy, yyqq, qmm, mdy,
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Page 42 and 43: TSQL Functions4.1.30 POWERPOWER(num
Page 44 and 45: TSQL Functions4.1.41 SPACESPACE(num
Page 46 and 47: TSQL Functions4.1.50 YEARYEAR(date)
Page 48 and 49: TSQL Variables5.2 Special Variables
Page 51 and 52: 6Using the TSQL Shell6.1 Getting St
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